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Post by tomgholmes on Feb 12, 2012 19:56:15 GMT
No, you'll always have a train's length between the two, ATP (Auto or CM) will not allow the train behind to enter the track circuit ahead if its not clear, it will stop you at the BMB. It's not always a train length though? I mean some BMB's are less than 25 meters apart, but it's safe because the speed enforced in that section means if you go through the BMB you'll stop before hitting the back of the train in front. Correct? |
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Post by causton on Feb 12, 2012 21:15:55 GMT
Correct, such as stations (which is why you have to go through them at 5mph when they are closed!) ...I *thought* my OpenBVE simulation was inaccurate when I stopped at a signal with the train in front was in the platform literally three metres in front!  (Northern Line if you're wondering!) |
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Post by Guest on Feb 12, 2012 23:25:38 GMT
I did not reailise that trains could get so close to each other on a fixed block signaling system? The trains safety systems would have to be turned off, so restricted manual selected, then there is no limits to how close you can get. Nothing to stop conventionally signaled lines doing this, I don't know if there's a tripcock override or similar, or whether the train just gets tripped and restarts. I think on those lines the safety procedure is to get tripped, reset, restart, and motor up slowly. |
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Post by kdotj on Feb 12, 2012 23:48:50 GMT
Thanks for the replies guys.
I had guessed that it was probably something like that, maybe the trains being moved due to some sort of disruption. I was just surprised to see them that close together.
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Post by racka on Feb 13, 2012 16:25:09 GMT
The trains safety systems would have to be turned off, so restricted manual selected, then there is no limits to how close you can get. Nothing to stop conventionally signaled lines doing this, I don't know if there's a tripcock override or similar, or whether the train just gets tripped and restarts. I think on those lines the safety procedure is to get tripped, reset, restart, and motor up slowly. It is, and some trains have a SCAT (Speed Control After Tripping) timer to ensure that the train speed is restricted for 2 mins after the trip occurs. |
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Post by plasmid on Feb 14, 2012 21:15:10 GMT
I've seen it in normal service (supposedly), I walked down the stairs to the rear of the Eastbound platform as a 92ts was just leaving and there was one behind with the front about 5 metres from the platform which seemed to come to a stop quite harsly, then he whistled for a long time for some reason. Once the train in front had left he proceeded into the station uber slowly.
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Post by superteacher on Feb 14, 2012 22:30:27 GMT
On the Vic, the train behind seems to draw up closer than what I've seen on other lines.
In days gone past when they had speed controlled signalling, the front of the next train was able to enter the platform as the read of the first train was leaving it.
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North End
Beneath Newington Causeway
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Post by North End on Feb 14, 2012 23:00:52 GMT
On the Vic, the train behind seems to draw up closer than what I've seen on other lines. In days gone past when they had speed controlled signalling, the front of the next train was able to enter the platform as the read of the first train was leaving it. On the Northern, this can very nearly be achieved at Oval n/b and Waterloo n/b when the service is blocking back. Takes a bit of nerve, and get it wrong and there's a very high chance of a SPAD! Oval n/b is also a bit un-nerving if there's a train held at the first signal after the platform. If that train's been there a while, it's possible for the next train to come into the platform at full speed (35 mph) on greens, including a green signal under the platform about 1 car length in, and yet be confronted with the rear of a train only a very short distance beyond the station starter. Gave me a fright the first time I experienced this -- running on greens all the way up from Morden, come round the corner into Oval also on greens and at full speed, and suddenly there's a train in front! Liverpool Street outer rail was/is like that, but the signalling was modified a few years ago so that if a train is just beyond the starter, the next train has to reduce speed at the home signal(s). I'm surprised the Oval setup hasn't been flagged up for mitigation works, as what with the first signal after the platform being semi (B.34) and a comparatively high chance of a train being held there, a full-speed SPAD on the station starter would not have a pleasant outcome. |
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Post by Option 7 on Feb 15, 2012 1:10:38 GMT
Gave me a fright the first time I experienced this -- running on greens all the way up from Morden, come round the corner into Oval also on greens and at full speed, and suddenly there's a train in front! That sounds like brown trousers time! |
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Post by Guest on Feb 15, 2012 17:10:37 GMT
I suppose when the Northern goes TBTC this will be a frequent occurrance with trains close to each other!
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Post by trt on Feb 15, 2012 17:15:22 GMT
How will that axle counter at Euston City S/B work over the junction? If a train goes off towards the N/B track with the aim of reversing into the old platform stub, then it won't have cleared the axle counters on the outbound arm of that junction. And if it does clear, then it will definitely sit on top of it when the train is backed up and stabled.
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Post by fleetline on Apr 17, 2012 18:35:31 GMT
I've seen on the Northern Line at Elephant & Castle. Tho as the platforms a bit longer han the 95ts, there was a whole train in platform with doors open and second one almost touching with cab by the swing gate.
Didn't realise at first but when you clock it, makes you jump!
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Chris M
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Post by Chris M on Apr 17, 2012 20:38:42 GMT
That sounds like the second train has been brought forward to detrain through the cab. This will normally only happen when the train in the platform has some sort of problem that prevents it being (quickly) moved, although I suppose if you have to detrain two trains you can do this to start emptying the second before the first is complete. I've only seen this once (at Newbury Park inner rail), and I know it's not common but how often it actually happens I don't know.
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Post by superteacher on Apr 17, 2012 21:02:31 GMT
That sounds like the second train has been brought forward to detrain through the cab. This will normally only happen when the train in the platform has some sort of problem that prevents it being (quickly) moved, although I suppose if you have to detrain two trains you can do this to start emptying the second before the first is complete. I've only seen this once (at Newbury Park inner rail), and I know it's not common but how often it actually happens I don't know. Seen it a couple of times over the years. First time was at Euston Square outer rail when an A stock was brought forward to detrain with a C stock in the platform. |
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Post by yorkshirerail on Apr 25, 2012 9:09:29 GMT
I've seen it on the Central line (I thinkt that's correct) when the train is sat in the platform, you can see the lights of the approaching train in the tunnel and seconds after the first train has gone, the second has moved in
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