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| Setting a route over a level crossing Yesterday at 14:56 #159203 | |
bugsy
1763 posts |
Am I being naughty if I set a route over a level crossing before the crossing gates are lowered?
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| Setting a route over a level crossing Yesterday at 15:28 #159204 | |
TUT
530 posts |
If you're doing your Initial Signaller Training exam, yes, they take issue with that, at least with CCTV level crossings controlled by the signaller. In reality the ARS will do it and many set-ups are designed to work that way (set the route over the crossing and then it'll auto lower).
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| Setting a route over a level crossing Yesterday at 15:52 #159206 | |
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bugsy
1763 posts |
[quote=TUT;post=159204]If you're doing your Initial Signaller Training exam, yes, they take issue with that, at least with CCTV level crossings controlled by the signaller. In reality the ARS will do it and many set-ups are designed to work that way (set the route over the crossing and then it'll auto lower).[/quote) Thanks. I think that I will lower the barriers before setting the route from now onwards. Shouldn't make any difference anyhow. Everything that you make will be useful - providing it's made of chocolate. Log in to reply |
| Setting a route over a level crossing Yesterday at 16:04 #159208 | |
jc92
3684 posts |
NOMINALLY you could argue it opens up the possibility of a proceed aspect over an open crossing if the route is set and somehow the crossing proving circuits fail wrong side, in much the same way that you shouldn't overset a route through a track circuit failure in case an irregularity clears the route. As TUT says though, there's loads of examples of it systematically being the case this happens anyway and I'm not aware of any specific rulebook module that prevents it. "We don't stop camborne wednesdays" Log in to reply |
| Setting a route over a level crossing Yesterday at 16:19 #159209 | |
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TUT
530 posts |
Yes we were also trained not to call a route until the overlap was clear (unless specifically using a reduced overlap of course). Essentially (approach control arrangements, etc. aside) they only wanted you to try and clear a signal if all the conditions to clear it were met. So it should clear straight away. I suppose it's doing your job properly, in a way. No signaller ever wants to have to rely on the interlocking. We all make the occasional impromptu test of the interlocking from time to time, just to make sure it's still working, of course, but you try not to rely on it. On the other hand ARS will set the route when the overlap is occupied, although it will wait for the route to be clear up to the exit signal and of course use of an auto button chucks it all out of the window. I think the reasoning was basically: look, if the system does it and it goes wrong, it's the system's fault. If you do it and it goes wrong, you're the one answering the difficult questions. Last edited: Yesterday at 16:20 by TUT Reason: None given Log in to reply |
| Setting a route over a level crossing Yesterday at 18:29 #159210 | |
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Stephen Fulcher
2078 posts |
I have never been one to agree with the argument that you might cause a proceed with an overlap occupied or might cause a proceed with the barriers up etc. Interlockings are not designed to allow things that are fundamentally unsafe, and whilst nothing is impossible, that type of wrong side failure is rare. The main reason for not setting a route over a crossing before it is clear in SimSig for me is that if the crossing is blocked when lowered, you have to cancel all the routes before you can restroke the crossing. Many crossings, even CCTV, now have auto functions on their protecting signals and will lower automatically with a train approaching, the signaller only having to check the monitor and press clear. Log in to reply |
| Setting a route over a level crossing Yesterday at 18:42 #159211 | |
GeoffM
6376 posts |
TUT in post 159209 said:On the other hand ARS will set the route when the overlap is occupied, although it will wait for the route to be clear up to the exit signal and of course use of an auto button chucks it all out of the window.IECC ARS and TREARS (and SimSig!) all have a form of the interlocking logic for each route/point so it shouldn't "test" the interlocking by calling something that won't set. It can't do more complicated logic though, so sometimes it'll not call a route when it could have done, or will try to call a route when it shouldn't - typically when multiple swinging overlaps or interlocking boundaries are concerned. The idea behind ARS calling a route with the overlap occupied was, I believe, to gain those precious few seconds that would otherwise be used to swing points. SimSig Boss Log in to reply |
| Setting a route over a level crossing Yesterday at 21:18 #159212 | |
Steamer
3983 posts |
As a slight aside, it's worth noting that some level crossings in SimSig won't let you set a route until the crossing has been lowered and the clear button pressed. This is generally where the simulated box is a mechanical signalbox, where in reality you wouldn't be able to 'set the route', i.e. pull the signal lever, until the crossing has been closed.
"Don't stress/ relax/ let life roll off your backs./ Except for death and paying taxes/ everything in life.../ is only for now." (Avenue Q) Last edited: Yesterday at 21:19 by Steamer Reason: None given Log in to reply |