Control Tables Format and Syntax - RailCorp Engineering Internet

Engineering Guideline 

Signals 

EGG 1648 

CONTROL TABLES FORMAT AND 

SYNTAX 

Owner: Chief Engineer Signals and Control Systems 

Approved 

by: 

Warwick Allison 

Chief Engineer 

Signals and Control Systems 

Authorised 

by: 

Version 1.1 

Issued December 2012 

Geoff Yarrow 

Principal Engineer Signalling 

Principles & Design Standards 

Disclaimer 

This document was prepared for use on the RailCorp Network only. 

RailCorp makes no warranties, express or implied, that compliance with the contents of this document shall be 

sufficient to ensure safe systems or work or operation. It is the document user’s sole responsibility to ensure that the 

copy of the document it is viewing is the current version of the document as in use by RailCorp. 

RailCorp accepts no liability whatsoever in relation to the use of this document by any party, and RailCorp excludes 

any liability which arises in any manner by the use of this document. 

Copyright 

The information in this document is protected by Copyright and no part of this document may be reproduced, altered, 

stored or transmitted by any person without the prior consent of RailCorp. 

UNCONTROLLED WHEN PRINTED Page 1 of 17 

Engineering Guideline

RailCorp Engineering Guideline — Signals 

Control Tables Format and Syntax EGG 1648 

Document control 

Version Date Summary of change 

1.0 8 Nov. 2012 First Issue 

1.1 18 Dec.2012 Updated §7 for showing Override on signal (route) control 

table, and to clarify requirements for conditional clearing 

timers control table. 

Summary of changes from previous version 

Summary of change Section 

NOTE – If the final document is small enough for the ‘Contents’ and ‘Document control’ 

to fit on one page remove the page break between the existing pages 2 and 3. 

HOWEVER if the ‘Document control’ page carries over to a second page separate 

pages must be used for ‘Contents’ and ‘Document control’ 

If there are no changes or they are so minor that they will fit in the above table delete 

this table and its heading. 

© RailCorp Page 2 of 17 

Issued December 2012 UNCONTROLLED WHEN PRINTED Version 1.1



Contents 

1 Introduction .............................................................................................................................4 

2 Scope........................................................................................................................................4 

2.1 Application.................................................................................................................................4 

3 Reference documents.............................................................................................................4 

4 Terms and definitions.............................................................................................................4 

5 Control Tables Format............................................................................................................5 

5.1 File Format ................................................................................................................................5 

5.2 Document Layout ......................................................................................................................5 

6 Control Tables Syntax ............................................................................................................6 

6.1 Signal Names............................................................................................................................6 

6.2 General Notations .....................................................................................................................6 

6.3 Logic Notation ...........................................................................................................................6 

6.3.1 Track Timers..............................................................................................................8 

6.3.2 Conditional Clearing of Signals .................................................................................8 

6.4 Aspects......................................................................................................................................9 

6.4.1 Higher Aspects ..........................................................................................................9 

6.4.2 Lamp Proving...........................................................................................................10 

6.4.3 Co-Acting Signal Aspects ........................................................................................10 

6.5 Remarks..................................................................................................................................10 

7 Rules for specific Tables......................................................................................................11 

7.1 Routes.....................................................................................................................................11 

7.2 Level Crossings, Warning Lights ............................................................................................11 

7.3 Timers .....................................................................................................................................11 

7.4 Section Control........................................................................................................................12 

7.5 Trainstops ...............................................................................................................................12 

Appendix A Sample Tables........................................................................................................13 





1 Introduction 

2 Scope 

Control Tables define safety and operational requirements for a signalling arrangement in 

a textual manner. They are initially prepared by a competent person who applies 

approved signalling standards, principles, and guidelines, to the proposed signalling 

layout and signalling functional specification. Once complete, they are manually 

translated by design engineers into circuit wiring diagrams and/or Computer Based 

Interlocking data expressions. They may be required for independent design of an 

operator control system. They are also used in the validation and testing processes. 

With the number of different parties involved in preparing and using control tables, it is 

essential that they are produced to a consistent standard for format and syntax. This will 

avoid misinterpretation in the design of wiring diagrams and CBI data expressions, and 

may facilitate possible use of computer programs to extract information from the control 

tables and convert to algorithmic expressions for software-based systems. 

2.1 Application 

This document is intended for use by all parties, internal or external, preparing, updating, 

or otherwise using, control tables for RailCorp signalling systems. 

3 Reference documents 

QSDP 29 Standard Forms 

4 Terms and definitions 

The following definitions apply in this document: 

Extensible Markup Language (XML): A computer file format used for storing formatted 

data in a plain text file, with the formatting data included amongst the textual content as 

'tags' enclosed within delimiting characters (markup) as defined in the open standard 

XML 1.0 Specification. Appropriate software tools display the content formatted 

according to the tags, or when editing the document, insert the tags. Being an open 

standard format based on plain text, it is relatively easy to develop tools to automatically 

process the data. 





5 Control Tables Format 

5.1 File Format 

Tables shall be prepared using the templates in QSDP29 Standard Forms. The 

templates are xml documents which can be edited in Microsoft Word or compatible 

applications. 

Control tables shall be prepared in Word, to take advantage of the inbuilt change tracking 

features. Any hand-written modifications during testing must be updated to the electronic 

copies before submission for review / verification. 

A separate file shall be used for each route, points, etc. This ensures that edits to one 

table cannot result in inadvertent changes in another table, and assists in tracking edits 

either by file modification dates or using document management software (e.g. 

SourceSafe). 

5.2 Document Layout 

The layout and naming of fields must not be changed. 

When editing tables in Word, fields will automatically ‘grow’ to a new line as the text 

reaches the end of the available space. However, for entries such as Route Locking and 

for automatic signals, warning lights, etc, where a row of data encompassing several 

columns makes up a single entry, each entry must be in a new table row. Macro buttons 

are provided on the relevant sheets to insert new rows at the bottom of the appropriate 

section. 

The table will also automatically flow to a new page as necessary. The templates are 

formatted to repeat header rows at the top of each page, which will be the fields 

identifying the route, points, etc, for which the control table applies. 





6 Control Tables Syntax 

6.1 Signal Names 

On control tables, the full signal name/identifier will typically be given only in the ‘Signal’ 

field at the top of the table. Thereafter, any alphabetic prefix and suffix shall be not 

included unless it is necessary to uniquely identify the signal, such as distance-numbered 

signals at the same distance in multiple track or bi-directional areas, or to denote a signal 

at an adjacent interlocking. 

6.2 General Notations 

The percent sign ‘%’ shown after a track circuit name is used to denote the named track 

circuit is occupied, e.g. 6AT%. 

Double quotations marks ( ” ) after a numerical value denote a time in seconds, e.g. 120”. 

Lower-case ‘w’ means ‘with’. 

The ‘at’ symbol ‘@’ means points or releases are locked and detected only. 

Points are denoted Normal or Reverse using ‘N’ or ‘R’ respectively after the points 

number, but this is not required where the context makes the intent clear – for example, 

in the ‘Normal’ field under ‘Sets, Locks and Detects Points’ of a route control table, the ‘N’ 

or ‘R’ is only required with a second set of points which is a condition for calling the first 

set. 

Routes are denoted Reverse by using ‘R’ after the route. A route without ‘R’ is generally 

understood to be Normal, except when context makes clear that routes are reverse – for 

example, in the ‘Set and Locked by Routes’ field of a points control table. 

Separate terms shall be delineated by at least one space (or new line if necessary); the 

use of multiple spaces is permitted to aid readability. 

6.3 Logic Notation 

Control tables are written in a form similar to Boolean expression. Boolean expression 

already has defined syntax, and in general the language of control tables should not 

contradict general Boolean rules. For example, AND logic takes precedence over OR 

logic. 

AND Logic 

A full stop shall be used to denote that terms are to be combined by logical ‘and’ (i.e. 

series contacts). Commas shall not be used. The full stop is consistent with general 

notation using a dot to denote ‘and’ when writing logic expressions. The general rule for 

separating different terms with a space ensures there is no confusion when writing 

distance-based names of signals or track circuits with a decimal point. 

e.g. 

21(S)B. 26(M)A. 26(S)A. 34(M) 

43AT. 43BT. 19.3AT. 19.3BT 

Where the list continues over multiple lines, the full stop should be included at the end of 

each line except the last. 





OR Logic 

The word ‘or’ (lower case) shall be used to denote that terms are to be combined by 

logical ‘or’ (i.e. parallel circuit paths), e.g. 

[103N or 104R] 

[22.7AT% or 22.1CT%] 

Negated Logic 

Most statements relating to track circuits require the track circuit unoccupied; an occupied 

track circuit is denoted with % as described earlier. 

Routes and points are either Normal or Reverse, so NOT logic is rarely required with 

these. Where negated logic is required, the word ‘not’ (lower case) shall be used, with a 

space either side, e.g. 

[212N w 211R and not free] 

Conditional Logic 

In the general population, conditional logic would take the form ‘if X then Y’. On control 

tables, it is expressed in the form of ‘Y w X’, where ‘w’ means ‘with’ (or ‘when’). For 

example, 

[49(M)B w 203R] 

[31YT w 202R] 

Conditional logic is usually implemented as ‘X or (not Y)’, so should be treated the same 

as an OR statement in terms of precedence of evaluation. 

Converse Locking and Preferences 

Where locking alternatives exist and one must be chosen, multiple converse statements 

are written. In the example of a route requiring either 49(M)B route normal or 203 points 

normal, the statements are written in the form 

[49(M)B w 203R] 

[203N w 49(M)BR] 

In the above case, if route 49(M)B is not normal, the interlocking does not have the option 

to normalise the route, so the points must be called. However, where locking alternatives 

include multiple sets of points, an order of preference must be determined, and is 

denoted by a number after the statement: 

[204N w 207R]1 

[207N w 204R]2 

In some circumstances, allowing the interlocking to automatically select one of the 

options is undesirable, so it will be ‘locked and detected only’: 

[206N w 204N] 

[204R w 206R]@ 





Brackets and Parentheses 

Brackets [ ], parentheses ( ( ), and braces { }, may be used interchangeably whenever 

‘brackets’ are referenced in this guideline. Brackets [ ] should be used as first preference, 

preference, 

to to reduce visual confusion with the parentheses used for (M) or (S) route notation. When 

nesting multiple levels of brackets (i.e. brackets within brackets), different shaped 

brackets shall be used used where possible to avoid having the same shaped brackets 

adjacent, e.g. [(xyz). {abc}] . 

In general Boolean expression, brackets are are only only required when OR OR logic must take 

precedence precedence over over AND logic. For example, on the following following track layouts the tracks tracks 

required clear for the overlap are: 

31AT. [31BT. 31CT w 202N]. [31XT. 31YT w 202R] 

It is preferable however to use additional brackets to avoid any ambiguity. 

31AT. [(31BT. 31CT) w 202N]. [(31XT. 31YT) w 202R] 

Where possible, nesting of more than three sets of brackets should be avoided, by 

breaking complex statements down, even if that results in repetition. 

[({39BT w 107N}. {40AT w 107R}. {40BT w 107R. 108R}) or 23BT JR] 

6.3.1 Track Timers 

31AT 31BT 

202 

31CT 

31XT 31YT 

Track timers used either for for speed speed checking (conditional clearing of signals or trainstops) trainstops) 

or for release of route route holding are calculated based on a a required speed speed and and the length of 

the timing track(s). A A specific table is is provided for calculating these these timers. To minimise 

potential for errors, errors, any function which uses one of these timers timers should refer refer to the the timing 

function, not the duration of the timer. 

After using route Released by 

[{44(M)B or 44(S)B} w 107R] 44BT JR(P) 

6.3.2 Conditional Clearing of Signals 

Conditional clearing shall be written as an ‘or’ statement. For clarity, the conditional 

portion of the statement should be written on a new line. 

14.5AT. 14.5BT. 14.9AT. 

[(14.9BT. 14.9CT) or 13.7BT JR] 





6.4 Aspects 

Aspects shall be described using the following notation 

R 

Y 

PY 

G 

LH BOL 

RH BOL 

LH PBOL 

RH PBOL 

LH TOR 

RH TOR 

Red 

Yellow 

Pulsating Yellow 

Green 

Left-hand ‘Band of Lights’ 

Right-hand ‘Band of Lights’ 

Left-hand Pulsating ‘Band of Lights’ 

Right-hand Pulsating ‘Band of Lights’ 

Left-hand Turnout Repeater 

Right-hand Turnout Repeater 

LS Low Speed 

Shunt Yellow shunt (either subsidiary aspect or ground shunt) 

TS 

Trainstop 

ITS 

Intermediate Trainstop 

For double-light signal indications, the indication shall be written in the form 

top head / bottom head 

e.g. G/R for ‘green over red’. 

Where a route indicator is used, the character(s) displayed by the route indicator are 

appended to the indication as follows: 

Y/R + ‘DE’ 

RH BOL + ‘R’ 

Shunt + ‘US’ 

A Turnout Repeater is denoted: 

G/Y + RH TOR 

Where a signal can simultaneously display both a main line route indicator and a turnout 

repeater, the route indicator (as the immediate information) shall be appended first, then 

the turnout repeater: 

G/PY + ‘M’ + LH TOR 

For subsidiary indications, and for a turnout indication on a single-light signal, the red 

indication of the main signal is not to be stated. 

LS not R/R/LS 

LH BOL not R/LH BOL 

6.4.1 Higher Aspects 

Higher aspects shall generally be written using the notation as already described – 

indication and conditions: 

[G/Y w 60 G/R . 63TS R]. [G/G w 60 G/Y . 52 G/Y . 63TS R] 





6.4.2 Lamp Proving 

Lamp proving for single-light signals and for turnout repeaters shall not be detailed on 

control tables. 

6.4.3 Co-Acting Signal Aspects 

Where a co-acting signal is provided, indications for the co-acting shall be detailed in the 

‘Higher Aspects’ field of the table, on a separate line after the higher aspects of the 

parent signal. The keywords ‘Co-acting’ and ‘parent’ must be used. 

If the co-acting signal displays exactly the same indications as the main signal, it shall be 

noted as: 

[Co-acting as per parent] 

Where the co-acting signal displays different indications (typically where a single-light 

‘dwarf’ signal is used to co-act for a double-light signal), each indication shall be listed 

with the conditions of the parent signal, e.g. 

6.5 Remarks 

[Co-acting Y + ‘L’ w parent G/R or G/Y]. [Co-acting G w parent G/G] 

For readability, use of upper- and lower-case should be as per the examples. 

Remarks fall into two broad categories: 

a) details which are not covered by any of the standard fields of the tables, and 

b) variations to standard implementation. 

Where the remarks are detailing variations, they will usually relate to a specific entry in 

the table. In such cases, a crosshatch mark (#) shall be added after the relevant 

statement in the control table to reference the remark. Where multiple statements refer to 

different remarks, each shall be numbered #1, #2, etc. Multiple statements can reference 

a single remark where appropriate. 

To support possible future automated processing of control tables, common remarks 

should use consistent wording as follows: 

[Guard’s Indicator] 

[Route not to set if ] 

[Signal not to clear until ] 

[Must detect before setting with ] 

[Flashing green repeater] 

[Locking required at RUR level] 

[No automatic normalising] [No lever stick] 





7 Rules for specific Tables 

7.1 Routes 

The Auto-reclearing and Quick Release (for Approach Locking) fields require only ‘Yes’ 

or ‘No’. In particular, there shall be no reference specific track circuits, TZR, or POJR, for 

release of approach locking. Implementation shall be according to the standards in force 

at the time of design for new interlockings, or consistent with existing arrangements for 

modification of existing interlockings. 

The Override field must start with 'Sets route' or 'Cancels route', followed by any 

conditions, or 'Not applicable', e.g.: 

Cancels route with [list of tracks required unoccupied] or override route normalising 

timer 

Through running 

Sets route and auto-reclearing 

Automatic turn-back 

Sets route with 15BT% 60" 

Automatic Normalising and Lever Stick are not shown on the table. It is assumed that 

Automatic Normalising is provided, and the first track after the signal is used for the Lever 

Stick. If a route is required to not automatically normalise and / or a different lever stick 

arrangement is required (including no lever stick), this shall be recorded in the Remarks 

field. 

7.2 Level Crossings, Warning Lights 

7.3 Timers 

These tables are only used to define the track circuit control for the warning equipment. 

Any interlocking with signals – delay clearing of signals to achieve minimum warning 

time, or continuation of warning until approach locking is released – is to be described on 

the appropriate signal control tables. 

Separate sheets are provided for conditional clearing timers (may include timers for 

intermediate trainstops) and route locking release timers. 

Word does not recalculate formulas after an input value is changed. A macro button is 

provided to recalculate timers. Enter the input parameters for each timer, then press the 

button to recalculate. The macro will determine a CALCULATED time for the proving 

speed and timing track length, to provide a SET TIME for practical use. As per design 

principles, the macro will round release timers up to the next multiple of 15 seconds. 

Conditional clearing timers will be rounded down by between 0.7 and 1.7 seconds to 

allow for trainstop drive time. After the theoretical time is calculated, the designer should 

review the calculated ALLOWANCE and SET TIME, and may make adjustments if 

required. Timers should always be rounded to whole seconds. 

Note that if any parameters are changed, or new timers added, it will be necessary to 

press the macro button to recalculate the timers. This will recalculate all timers in the file. 

Where the CALCULATED TIME of an existing entry changes, the SET TIME will be 





automatically deleted. Where the CALCULATED TIME does not change, the SET TIME 

will remain. 

7.4 Section Control 

The Section Control control table is largely redundant. Requirements for single line and 

bi-directional controls are more appropriately described on the control tables for the 

starting signals and, where applicable, in-section automatic signals. 

7.5 Trainstops 

The Trainstop control table is largely redundant. Requirements for intermediate 

trainstops shall generally be included on control tables for signals. 





Appendix A Sample Tables 

The following examples are not intended to reflect any specific track layout, but only to 

demonstrate the use of syntax, including samples of converse locking statements. 





Route Control Table 

INTERLOCKING South Gotham SIGNAL SG27 ROUTE 27(M)B 

Commence 27(M) Set by - 

Finish 39(M) Also sets 33(S)B 

Auto-reclearing Yes First Aspect G/R 

Override Cancels route with [list of approach tracks] clear or override route normalising timer 

REQUIRES ROUTES 27(S)B. 30(M). 30(S). 38(S). 40(M)B. 40(S)B. 42(S)B. 

NORMAL 

[(44(M)B. 44(S)B) W 107R] 

SETS, LOCKS AND DETECTS POINTS 

104. 105. 106. 

(@ = Locked and Detected Only) (% = Occupied) 

Normal 

Reverse 

[107 w 44(M)BR or 44(S)BR] 

[114 w 115R]1. [115 w 114R]2 

[112 w 111N] 

[111 w 112R]@ 

SET AND INDIRECTLY LOCKED 

Normal [112 w 25(M)R. 62(M)R] 

Reverse 

SET POINTS IN [105N. 106N then 104N w 23(M)R] 

SEQUENCE 

Trainstops 27, 30 

[30 held by (27AT% or 27BT%) W 104N] 

ROUTE LOCKING 

Locked by tracks After using route Released by 

[44AT w 111N]. 44BT [{44(M)B or 44(S)B} w 107R] 44BT JR(P) 

39AT. 27DT 38(S) #1 - 

[{40AT. 40BT} w 107R]. 39AT. 27DT 40(M)B or 40(S)B or 42(S)B #1 - 

REQUIRES TRACKS 27AT. 27BT. 27CT. 27DT. 39AT. [40BT w 107R]. 

CLEAR 

[({39BT w 107N}. {40AT w 107R}. {40BT w 107R. 108R}) or 23BT JR] 

ASPECTS 

APPROACH LOCKING 

[G/Y w 39 G/R. 34TS R]. [G/G w {39 G/Y or G/G}. 34TS R] 

[Co-acting Y + ‘M’ w parent {G/R or G/Y}]. [Co-acting G w parent G/G] 

Locked by tracks 23BT. 23AT. [{17BT. 17AT} w 23(M)R] 

Release timer 120” Quick Release No 

REMARKS [Guards indicator] 

#1: [Locking required at RUR level] 

DESIGNER JOB No. S12345 VERSION DATE 01 Apr 2012 





Points Control Table 

INTERLOCKING South Gotham POINT 107 

TRACK LOCKING 39AT. 40BT 

SET AND LOCKED BY ROUTES (@ = Locked and Detected Only) (% = Occupied) 

Normal 

38(S). 39(M)A. 39(S)A. 40(M)A. 40(S)A. 41(M)A. 41(S)A. 41(S)B. 42(S)A. 46(S)A. 

[27(M)B w {44(M)BR or 44(S)BR]. [27(S)B w 44(M)BR]. [33(S)A w 44(M)BR]. 

[44(M)B w {27(M)BR or 27(S)BR or 33(S)AR}]. [44(S)B w 27(M)BR] 

Reverse 

39(S)B. 39(S)C. 40(M)B. 40(S)B. 42(S)B 

SET ONLY BY ROUTES 

Normal 32(M)B w 19(M).56(M) 

Reverse 

SET AND LOCKED BY RELEASES SET ONLY BY RELEASES 

Normal 

Reverse 

ROUTE LOCKING 

Locked NORMAL by tracks After using route Released by 

[(27AT. 27BT) w 104N]. 27CT. 27DT [27(M)B w {44(M)BR or 44(S)BR}] 27DT% JR(P) 

[(27AT. 27BT) w 104N]. 27CT. 27DT [27(S)B w 44(M)BR] 27DT% JR(P) 

[44AT w 111N]. 44BT [44(M)B w {27(M)BR or 27(S)BR or 33(S)AR}] 44BT% JR(P) 

[44AT w 111N]. 44BT [44(S)B w 27(M)BR] 44BT% JR(P) 

40AT 40(M)A or 40(S)A or 42(S)A 39BT% JR(P) 

[{(47AT w 112N). 45BT} w 109 N]. 45AT. 39BT 46(S)A - 

Locked REVERSE by tracks After using route Released by 

40AT 40(M)B or 40(S)B or 42(S)B - 

OVERLAP MAINTENANCE 

Held NORMAL by tracks After using route Released by 

27DT 44(M)B 44BT% JR(P) 

40AT. [TBAT w 108R] 27(M)B 27DT% JR(P) 

Held REVERSE by tracks After using route Released by 

40CT 44(M)B 44BT% JR(P) 

39BT 27(M)B 27DT% JR(P) 

REMARKS 

DESIGNER JOB No. S12345 

VERSION DATE 01 Apr 2012 





Automatic Signals control table 

SECTION South Gotham - Metropolis 

SIGNAL LINE / km REQUIRES TRACKS CLEAR 

M14.9 Down Main 

14.883 

L14.9 Down Local 

14.885 

M14.9AT. M14.9BT. M15.7AT. 

[(M15.7BT. M16.3AT) or 447CT JR] 

L14.9AT. L14.9BT. L15.7AT. 

[L15.7BT or 451CT JR] 

ASPECTS 

First Higher 

G/R G/Y w M15.7 G/R 

G/PY w M15.7 G/Y 

G/G w M15.7 G/G 

G/R G/Y w L15.7 G/R 

G/G w L15.7 G/Y or G/G 

TRAINSTOP REMARKS 


Conditional Clearing Timers control table 

SECTION / INTERLOCKING South Gotham - Metropolis 

SIGNAL APPROACH CONDITIONAL OVERLAP TIMING APPROACH TIMER (s) 

or TRACK(S) LENGTH 

TRACK(S) LENGTH Ave. BRAKE SPEED CALCULATED ALLOWANCE SET 

TRAINSTOP 

(m) 

(m) GRADE CURVE (km/h) 

TIME 

M14.9 447CT 300 M15.7AT 220 -150 GE52A 43 25.1 1.1 24 

L14.9 451BT 332 L15.7AT 220 -150 GE52A 43 27.8 0.8 27 


Release Timers control table 

SECTION / INTERLOCKING South Gotham 

TIMER PURPOSE TIMING DISTANCE (m) TARGET SPEED (km/h) CALCULATED TIMER (s) SET TIME (s) 

34BT JRP Route Release 187 15 44.9 45 





Issued December 2012 UNCONTROLLED WHEN PRINTED Version 1.1 

M14.9 

L14.9



Warning Light control table 


WARNING 

LIGHT 

LINE / km UP APPROACH LOCAL TRACK DOWN APPROACH REMARKS 

9.554 Down N/A 5.33CT 4.87CT. 5.33AT. 5.33BT Average speed 55km/h 

9.554 Up 6.44AT. 6.24AT. 6.24BT 5.92AT N/A 


Level Crossing control table 


LEVEL CROSSING / 

UP APPROACH CROSSING 

LOCATION 

TRACK 

Lethbridge-Stewart Lane UX1T. UX2T. UXT 

49.455km 

DXT 

DOWN APPROACH REMARKS 

DX1T. DX2T.

Control Tables Format and Syntax - RailCorp Engineering Internet

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