In article ,
Peter Lawrence wrote:
Maybe there is now no safety objection to a signal in mid-platform
since slam doors have gone. If the signal is at danger the train will
stop there but the doors will not open; when it clears the train must
move on to the platform end for the station stop. This is inefficient
but not unsafe. Since the signal is for 'wrong line' movement, the
need to stop at it may never occur anyhow!

"Wrong line" movements on the West London Line are not that uncommon, but I
suppose that signal stops are fairly rare.

--
David Wild using RISC OS on broadband