2010 Q1 Signal Spacing

[greatnessjason]

Hi,

An attempt for comment please.
In regard to the last part of the question, I found a paper online (Might be of interest) that actually suggests that there are no safety issues with driving on repeated cautions..hmm..

[PJW]

Re the last part.

I think that this has been written primarily to look at the repeated double yellows which are very much part of the signalling on the commuter line into Liverpool Street from East London. The current signalling dates from around 1995 but this really perpetuated what was already there which I believe was the first MAS on that line commissioned shortly after the 2nd World War. It is about to have further alterations in connection with Crossrail since the trains will emerge from the central section and operate over the GE route from Stratford to Shenfield.
The signals here are very closely spaced and much of the line is straight; I certainly remember being on Goodmayes Down Electric platform looking towards London with a train in the adjacent platform and seeing it had a G, then in front of it YY another YY, another YY, a Y, a R, another train and it having a G and then a YY in front of it.

I guess therefore that there is a history of 50-60 years and presumably very few if any incidents which goes some way to provide a justification for saying that it is acceptable. I think like many things, if everyone UNDERSTANDS then there is indeed little risk of confusion- it is all down to training and experience. I don't think it would be s sensible suddenly to introduce such an aspect sequence elsewhere as it would be alien to those used to such an area.

The cynical might also say that unless we were prepared to accept the ongoing use in the area, then it would stitch Crossrail and that would be politically unacceptable.

Hi,

An attempt for comment please.
In regard to the last part of the question, I found a paper online (Might be of interest) that actually suggests that there are no safety issues with driving on repeated cautions..hmm..