Deleted
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Post by Deleted on Jul 26, 2014 8:26:35 GMT
When were Rail Gap Indicators first introduced?
Also, when were the current one used now a days introduced?
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Post by tubeprune on Aug 5, 2014 17:00:14 GMT
On the LER, they began to appear in their current (sorry for the pun) form on the Bakerloo in 1917 and the Hampstead and Picc in 1918. The CLR seems to have had "current on line indicator lamps" before they were replaced by the LER type in 1923. The Appendix to the WTT of 1930 suggests that the DR started getting them in a few places before that date. Can't find anything on the Met. but they probably didn't get them before 1934.
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Post by abe on Aug 13, 2014 9:28:30 GMT
The Instruction Book and Rules for Sub-Station Attendants issued by the LER in 1919 notes that illuminated indicators are provided prior to section gaps in the current rails, and that if the section ahead is dead they will show a red light with a white band across. This suggests that the triangular plate with three red lights ('cherries') were a later development. Does anyone know when though?
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