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| Level Crossings Query 14/10/2010 at 13:17 #1900 | |
ajax103
1120 posts |
Kirknewton crossing near Midcalder Junction on the Edinburgh sim has three buttons which change automatically, they are R, W and F - does anyone know what they mean please? This is just one of three types of level crossings in the sim, the other two are fully automatic with the crossing controlling the controlling signal automatically and with the other crossing being able to raise automatically after the passage of a train and requires you to select clear in order for the controlling signal to display a proceed aspect. Currently having fun with the 1993 timetable and thought I ask, I have done a search here but can't seem to find anything to answer my query. Log in to reply |
| Level Crossings Query 14/10/2010 at 13:17 #11992 | |
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ajax103
1120 posts |
Kirknewton crossing near Midcalder Junction on the Edinburgh sim has three buttons which change automatically, they are R, W and F - does anyone know what they mean please? This is just one of three types of level crossings in the sim, the other two are fully automatic with the crossing controlling the controlling signal automatically and with the other crossing being able to raise automatically after the passage of a train and requires you to select clear in order for the controlling signal to display a proceed aspect. Currently having fun with the 1993 timetable and thought I ask, I have done a search here but can't seem to find anything to answer my query. Log in to reply |
| Level Crossings Query 14/10/2010 at 13:35 #11994 | |
AndyG
1842 posts |
As far as I know: R = Raised; W = Working, lights/lower/raise sequence in progress; F = Failed, usually when barriers are down for longer than a certain time for a reason, typically a TCF or a train standing on the crossing. See the WIKI page "Level crossings" I can only help one person a day. Today's not your day. Tomorrow doesn't look too good either. Log in to reply |
| Level Crossings Query 14/10/2010 at 14:15 #11995 | |
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Late Turn
699 posts 
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Kirknewton is an AHB (with Raised, Working and Failed indications, as Andy says), which operates automatically and independently of any 'protecting' signals (other than stopping/non-stopping controls or controls to prevent an adjacent signal clearing with a train standing at it, if there's a possibility that said train could otherwise reach the crossing before the sequence has completed). Not sure what the other 'automatic' type you refer to is - CCTV crossings, although they might be provided with auto-lower and auto-raise facilities, require the Signalman to press 'crossing clear' before the protecting signal can clear.
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| Level Crossings Query 14/10/2010 at 18:54 #11997 | |
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Lardybiker
771 posts |
In a nutshell, there are multiple different types of crossings across the UK all of which can be simulated in SimSig. Here are a few examples.... CCTV crossing will have lower and raise buttons as well as a clear. Some will have an auto-raise button also. Some input may be requires to lower and/oror raise but all will require the signaller to check the CCTV image of the crossing to ensure its clear before pressing the clear button. Another type is managed crossings. These crossings have a crossing box specifically to look after the crossing. Since the signaller generally has no direct control of these crossings, they are automated in the sim so it auto lowers and raises as if the crossing box keeper was doing his job. Then there are the numerous AHB types (automatic half barrier) . AHB's are automatic - For a full AHB, there are strike-in points 39 seconds from the crossings (29 seconds on single lines) on each line over the crossing. When a train strikes in, the barrier lower procedure begins and once the train passes, the barriers then auto raise (assuming there are no more trains coming that is!). These have (R)aise, (W)orking and (F)ailed buttons. Again, these are fully automatic. Most of the remaining types such as UWC, AOCL, and ABCL have no affect on the sim other than that calls to the signaller can be made from them from time to time when someone needs to cross and they generate a penalty if a train enters a crossing whilst someone is on it. Log in to reply |
| Level Crossings Query 15/10/2010 at 08:16 #12002 | |
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Late Turn
699 posts
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Lardybiker said:Another type is managed crossings. These crossings have a crossing box specifically to look after the crossing. Since the signaller generally has no direct control of these crossings, they are automated in the sim so it auto lowers and raises as if the crossing box keeper was doing his job. That's the one that didn't occur to me! In operation, they're no different to a CCTV crossing (indeed, many of them are CCTV supervised from the crossing 'box - think Peterborough!), but of course that operation is overseen by someone else, so the Signalman will just see his signals clear (if he's got any indication...) at the appropriate time. Log in to reply |
| Level Crossings Query 15/10/2010 at 08:32 #12003 | |
Peter Bennet
5402 posts |
There are 2 on SwinDid and half a dozen or so on Westbury Sim (Reading end). Peter I identify as half man half biscuit - crumbs! Log in to reply |
| Level Crossings Query 15/10/2010 at 12:54 #12004 | |
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clive
2789 posts |
Lardybiker: not quite. There's three basic classes of level crossing: interlocked, automated, and uncontrolled. Interlocked crossings are interlocked with the signals: the signals can't be cleared unless someone has checked that the crossing is properly closed and no vehicles are stuck on it. They have either full gates (MG) or full barriers (MCB). They can be controlled locally, remotely (i.e. from a nearby signal box that can see the crossing), or by CCTV. Automated crossings operate automatically as a train approaches, but there is no interlocking with the signalling (apart, as Late Turn says, from controls to stop the train getting there too quickly). They can have half-barriers (AHB or ABCL) or just lights (AOCL or AOCR). They can be monitored from a signalbox, usually with R/W/F lights on the panel and an alarm (AHB or AOCR) or monitored by the train driver, who needs to see a white flashing light (ABCL or AOCL). Uncontrolled crossings have no interlocking at all. They are known as "user worked crossings" (UWC) or "occupation crossings" (the difference is more legal than technical), "trainman operated" (TMO), or "open crossings" (OC). There may be a telephone to the signal box (so UWC(T) etc.). There's a hybrid between AOCL and UWC - the MWL crossing, which has miniature red and green lights to warn of the approach of a train. These can be on footpaths or private roads. I'm unclear whether delayed signal clearing applies to them or not. Log in to reply |
| Level Crossings Query 15/10/2010 at 15:05 #12007 | |
postal
5265 posts |
If anyone wants to delve any deeper, there are a couple of official documents on-line in regard to Level Crossings in the UK. Firstly, there are guidance notes about the design and operation of level crossings and secondly there is the Rule Book module laying out the instructions on the use of level crossings for signallers. “In life, there is always someone out there, who won’t like you, for whatever reason, don’t let the insecurities in their lives affect yours.” – Rashida Rowe Log in to reply |