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| Signals are rear-wheel replaced? 01/09/2011 at 20:49 #20484 | |
lpeters
160 posts |
On a recent trip to Hitchin I noticed that the DF signal 699 appeared to be rear-wheel replaced. I believe also DS signal 697 was the same. I didn't see any trains pass on the UF or the US to say about those.
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| Re: Signals are rear-wheel replaced? 01/09/2011 at 20:58 #20485 | |
jc92
3690 posts |
most of doncaster station and some of york station are rear wheel replaced (i beleive its called tail lamp replacement)
"We don't stop camborne wednesdays" Log in to reply |
| Re: Signals are rear-wheel replaced? 01/09/2011 at 21:18 #20486 | |
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UKTrainMan
1803 posts |
On the Wiki; First Wheel Replacement Last wheel replacement Any views and / or opinions expressed by myself are from me personally and do not represent those of any company I either work for or am a consultant for. Last edited: 01/09/2011 at 21:42 by UKTrainMan Reason: linkages :) Log in to reply |
| Re: Signals are rear-wheel replaced? 01/09/2011 at 21:22 #20487 | |
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lpeters
160 posts |
Sorry the reason I mentioned it is because the sim currently simulates those signals as first wheel replacement as opposed to last wheel replacement.
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| Re: Signals are rear-wheel replaced? 01/09/2011 at 21:42 #20488 | |
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jc92
3690 posts |
i dont think SimSig simulates any signals except shunts as rear wheel replaced (that i can think of) the lickey might be
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| Re: Signals are rear-wheel replaced? 01/09/2011 at 21:45 #20489 | |
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UKTrainMan
1803 posts |
" said:Sorry the reason I mentioned it is because the sim currently simulates those signals as first wheel replacement as opposed to last wheel replacement.I believe the era for the current version of KingsX is 2006(?) so it may be that in '06 those signals were first wheel replacement. Any views and / or opinions expressed by myself are from me personally and do not represent those of any company I either work for or am a consultant for. Log in to reply |
| Re: Signals are rear-wheel replaced? 01/09/2011 at 23:22 #20493 | |
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mfcooper
707 posts |
" said:i dont think SimSig simulates any signals except shunts as rear wheel replaced (that i can think of) the lickey might beAny type of signal can be set as Last Wheel Replacement in SimSig. Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 07:43 #20496 | |
BarryM
2158 posts |
" said:i dont think SimSig simulates any signals except shunts as rear wheel replaced (that i can think of) the lickey might be Euston has 2. Barry Barry, Sydney, New South Wales, Australia Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 08:13 #20498 | |
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Firefly
521 posts |
I should imagine they're Last Wheel replaced because of potential shunting moves to the Down Yard. (bearing in mind that it was commissioned in the early 70's). I would say the the Up Signals are almost certainly last wheel replacement as well. FF Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 12:22 #20502 | |
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Albert
1315 posts |
Gloucester sim has last-wheel replacement implemented, and that is not limited to shunt signals, so it must be possible in other sims.
AJP in games Last edited: 02/09/2011 at 12:22 by Albert Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 12:48 #20503 | |
GeoffM
6376 posts 
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It's just a flag to set in data per route so yes, it is possible for any signal/route. Note that some signals are second track replaced, mostly due to retro fitting TPWS onto existing circuitry and where the first wheel replacement would cause the TPWS grid to trip the train in the split second between the front wheels occupying the first track and the TPWS sensor on the train passing over the toast rack at the signal. SimSig Boss Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 13:14 #20507 | |
Peter Bennet
5402 posts |
" said:Gloucester sim has last-wheel replacement implemented, and that is not limited to shunt signals, so it must be possible in other sims.It's only a question of knowing the fact of LWR at any given signal. peter I identify as half man half biscuit - crumbs! Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 13:28 #20508 | |
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lpeters
160 posts |
I'm quite sure that they are LWR as I saw a 91 leading a rake + DVT return the signal to danger after the rear of the train passed the signal and the same for a single C365 and a 2xC313 on the DS. LWR would definately make sense if only because of the shunting moves possible there. The diesel reverse movements on the 1985 timetable from Hitchin US to DS to return north come to mind. If those were loco hauled the driver would need to see the aspect before it returned to danger and LWR would be required in one of the directions to allow this to happen.
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| Re: Signals are rear-wheel replaced? 02/09/2011 at 13:39 #20509 | |
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Peter Bennet
5402 posts |
As an aside - one other possibility would be where the O/Lap was not a separate TC so the restoration of the signal would be some 200yds beyond the signal or where ever the O/lap ended. I suspect that in the Hitchin area that is not the case (don't have the Sim to hand) and in any event different train lenghs would have a different effect. Peter I identify as half man half biscuit - crumbs! Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 14:27 #20511 | |
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lpeters
160 posts |
Just quickly checked the sim; it shows the track circuits as ending at or just pass the signal with the overlap extending all the way across the junction was a separate TC in both cases. Obviously, as was said earlier, there may have been some modifications to the track circuiting etc. as they have done some work in the Hitchin area recently; removing crossovers; preparing for the flyover etc.
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| Re: Signals are rear-wheel replaced? 02/09/2011 at 21:26 #20523 | |
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metcontrol
227 posts |
" said:I believe the era for the current version of KingsX is 2006(?) so it may be that in '06 those signals were first wheel replacement.I would probably put it a few years prior to that - crossovers at Hitchin and Hatfield being notable changes. As for Hitchin itself, cannot give a precise date, but noticed the signalling had altered to "rear-wheel replacement" 3 weeks ago - and my reason for being there at the time was a "one week in every 13 weeks cycle" on my roster at work. The previous time, as far as I can remember, the signalling operated "as SimSig" or as I remember it from my younger days being sat there waiting for a deltic or class 40 :cheer: in amongst the multitude of HSTs :sick: Therefore I think recent changes may have been made. Log in to reply |
| Re: Signals are rear-wheel replaced? 02/09/2011 at 21:45 #20524 | |
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lpeters
160 posts |
I know they are spending a lot of time in the Hitchin area at the moment. Could be one of the changes they have made. I think work on the actual flyover is due to start soon if it hasn't already. Lots of stock marshalled in Hitchin down yard at the moment.
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| Re: Signals are rear-wheel replaced? 03/09/2011 at 08:29 #20533 | |
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metcontrol
227 posts |
They do that from time to time. The rail grinding train has spent a few days in there, and a tamper was also in there the other day. Work on the flyover hasn't begun yet (believe it starts at the end of the year) and even when it does, it won't affect the main line (in terms of being connected) until near completion.
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