Canadian Rail Operating Rules (CROR) TC O-0-93 - PDF

TRACK UNIT (TU)
A vehicle or machine capable of on-track operation utilized for track inspection,
track work and other railway activities when on a track.
TRACK UNIT SPEED
A speed that;
(a) permits a track unit to stop within one-half the range of vision of equipment
or a track unit; and
(b) permits a track unit to stop short of a switch not properly lined or any
obstruction or track defect that may prevent safe passage.
Track units handling equipment must not exceed the authorized freight speed
including temporary speed restrictions whichever is less. The delivery method
for temporary speed restrictions will be indicated in special instructions.
TRACK WORK
Any work on or near the track that may render the track unsafe for movements at
normal speed or where protection against movements may be required for
employees and machines involved in track construction and repairs.
TRAILING END
The tail end of the last piece of equipment in a movement in the direction of
travel.
TRAIN
A train:
(a) is an engine which is intended to operate at speeds greater than 15 MPH;
(i) without cars; or
(ii) with cars and equipped with a TIBS or remote control locomotive at the
rear; or
(iii) with cars including a caboose occupied by a crew member; or
(iv) with cars in passenger service,
(b) is a track unit when so designated.
Note: An engine in yard service that is required to enter main track in CTC to
double over, take head room or cross over a main track will not be considered as
a train or transfer other than in the application of Rules 560-578.
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