2nd Edition
2nd Edition
2nd Edition
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List of Figures<br />
xxi<br />
8.2 Modern soft ground tunnel shield. 116<br />
8.3 Bored piles used as cut-and-cover tunnel support. 117<br />
8.4 Concrete lined vertical shaft. 119<br />
9.1 Diagram of typical 25 kV feeding arrangement. 124<br />
9.2 Modern 25 kV overhead equipment. 125<br />
9.3 AC and DC distribution on a DC system. 127<br />
10.1 Semaphore signals (photo by Paul Walker). 132<br />
10.2 The DC track circuit. 134<br />
10.3 Diagram showing point locking and detection. 135<br />
10.4 Headway distance and time. 136<br />
10.5 Former manual signal box (photo by Paul Walker). 138<br />
10.6 Three aspect electrical signalling at junction. 139<br />
10.7 Four aspect signalling. 140<br />
10.8 Train protection warning system (photo by Paul Walker). 144<br />
10.9 Signals at level crossing (photo by Paul Walker). 144<br />
11.1 Open and closed loop systems. 149<br />
11.2 The systems pyramid. 151<br />
11.3 Dot matrix departure indicator. 153<br />
12.1 An early underground escalator. 160<br />
12.2 A modern railway design using escalators and lifts. 163<br />
12.3 Typical escalator dimensions. 166<br />
12.4 Hydraulic lift for passengers at footbridge. 167<br />
12.5 Details at top of passenger lift. 169<br />
12.6 Details at bottom of passenger lift. 170
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