Page 1 of 1
| Signal 139/platform 8B 12/11/2013 at 11:42 #51404 | |
peterb
451 posts |
The above shunt signal appears to only change to an 'off' aspect when a train is right up to the signal, fair enough. I had a strange train just now, sat in 8A which rang because 139 was at red. I could tell that the train was not at the signal because of the track circuits. I set the route from 139, and the shunt signal remained at red but the train started moving. Why? Should the train have approached the signal regardless and called if the signal remained at red? (i.e., should whether a route is set have any bearing on the movement of the train in this scenario) Log in to reply |
| Signal 139/platform 8B 12/11/2013 at 12:06 #51405 | |
|
GoochyB
222 posts |
I have noticed this behaviour before, I think also in Sheffield although I can't recall the precise location. I expect that it is common to approach released signals.
Log in to reply |
| Signal 139/platform 8B 12/11/2013 at 12:24 #51407 | |
|
peterb
451 posts |
" said:I have noticed this behaviour before, I think also in Sheffield although I can't recall the precise location. I expect that it is common to approach released signals. I understand approach-release, but not why a train's movement appears to be triggered by a route set from one! Log in to reply |
| Signal 139/platform 8B 12/11/2013 at 12:47 #51409 | |
|
GoochyB
222 posts |
I suspect it is an issue with coding/behaviour in Simsig, which would need code to tell the driver to draw forward towards the signal to within the release circuit. It appears that default behaviour in sims is for a train that has stopped in a station within sight of the signal to await the signal's clearance before moving off rather than drawing forward to then stop at the platform end. Indeed, this is normal behaviour in stations in real life. There is an exception at termini (certainly KX and I think Euston too) where certainly light engines detached from the front of incoming workings will run up to the signal even if it is not clear - there may be other specific reasons that trigger that. Log in to reply |
| Signal 139/platform 8B 12/11/2013 at 15:50 #51419 | |
jc92
3629 posts |
its not simulation specific, I have encountered it on Lime St. and Euston with light locos coming off the blocks. It has been reported elsewhere IIRC. "We don't stop camborne wednesdays" Log in to reply |
| Signal 139/platform 8B 12/11/2013 at 16:46 #51423 | |
GeoffM
6280 posts |
The code is written to avoid chicken-and-egg situations like this - train waiting for the signal to show a proceed aspect; signal waiting for the train to approach. As to whether the signal should have been approach controlled is another question!
SimSig Boss Log in to reply |
| Signal 139/platform 8B 16/11/2013 at 06:04 #51596 | |
|
Hawk777
386 posts |
Surely this is a problem in real life as well? Wouldn’t a more realistic solution be that the train that is in rear of that signal must always draw up to the signal rather than waiting for it to clear?
Log in to reply |
| Signal 139/platform 8B 16/11/2013 at 18:37 #51612 | |
|
jc92
3629 posts |
" said:Surely this is a problem in real life as well? Wouldn’t a more realistic solution be that the train that is in rear of that signal must always draw up to the signal rather than waiting for it to clear?that's what they normally do. I've seen SWT ECS at exeter draw forward to the signal, and then wait for it clear. Equally light locos at euston would draw forward, after the train they had been released from and then call in at the starter to tell the signalman where they are for. "We don't stop camborne wednesdays" Log in to reply |
| Signal 139/platform 8B 16/11/2013 at 19:13 #51614 | |
|
Late Turn
696 posts |
Nothing should normally move along a platform, particularly a permissive one, until the signal's cleared for it or it otherwise has authority - the exception being a light loco immediately following its train out to the platform starter at a terminus. It'd be most inconvenient to start drawing up to the signal and meet an arriving train that's been signalled in on top  .
Log in to reply |
| Signal 139/platform 8B 16/11/2013 at 19:51 #51616 | |
|
Forest Pines
525 posts |
I have known down trains at my local station, Stapleton Road, draw forwards to the next signal, which is visible but several hundred yards away, when it's at red (it's on the Bristol sim - the signal is B250 and its position is about half way from the Stapleton Road platform end to Lawrence Hill ground frame). It's rather rare; when it does happen, the guard gives the driver the "draw forward" signal instead of "right away". I wonder what station has the furthest-away next signal that is still visible from the platform? The furthest I know of personally is Rosyth Halt, where the next signal for up trains is at Inverkeithing North Jn, about a mile away but clearly visible in good weather. Log in to reply |