Author Topic: Underground signals (token + absolute block)  (Read 799 times)

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Offline Vladki

Underground signals (token + absolute block)
« on: September 12, 2017, 07:39:07 PM »
There is no underground version of token block signal. Also the on-staff box is available only overground. Is that intentional?

Also, was there a color light (and undergoud) version of combined absolute block signal - the one with red and yellow arm?

Offline jamespetts

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Re: Underground signals (token + absolute block)
« Reply #1 on: September 12, 2017, 10:01:41 PM »
I have modified the one train staff cabinet to be able to be built underground.

As to token block signalling, I am not aware of any real life example of electric token block signalling being used underground - I cannot imagine how the tablet exchange system would actually work in a tunnel. Are you aware of any examples of this?

As to colour light combined signals - I am not sure whether there were any significant examples of this, as I suspect that proper multiple aspect signalling was introduced whenever this would have been relevant. Are you aware of any significant historical examples of a signal of this type? Presumably, it would not be the same as a multiple aspect signal, but would show two simultaneous aspects?
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Offline Vladki

Re: Underground signals (token + absolute block)
« Reply #2 on: September 13, 2017, 06:46:19 AM »
I do not know any examples of either. It was just the demo game that made me think of them. In practice I see no problem with having a token machine placed in underground station (though not in plain tunnel). But I expect that most of the underground lines were double tracked anyway, so tokens were probably not necessary.