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Post by trt on Aug 9, 2016 8:57:02 GMT
A question has been asked on a tech website...
I'd like to offer a reply; I think it's best to ask in here!
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North End
Beneath Newington Causeway
Posts: 1,769
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Post by North End on Aug 9, 2016 15:33:04 GMT
A question has been asked on a tech website... I'd like to offer a reply; I think it's best to ask in here! I'd suggest: 1) A higher than typical proportion of signals in the area have speed-control in one form or another, the presence of which sometimes influences people to anticipate signals clearing (subconsciously or misunderstanding how a signal works) and getting caught out when the signal remains on. Coming down from Oakwood is on a gradient too so less forgiving of a misjudgement. 2) Lots of conflicting moves and a high likelihood of 'blocking back' through the area for various reasons, simply meaning there's a higher than typical chance of signals remaining on. This combined with the (1) is a high-risk combination. 3) A crew-relief point so a higher than typical risk of distractions, eg thinking about going to the toilet, packing bag in readiness for a quick getaway, looking at duty book, etc etc. Not being my area I can't comment on sighting, which may or may not also be a factor for some signals. |
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Post by PiccNT on Aug 9, 2016 15:51:51 GMT
Yes, everything North End states is absolutely valid. In addition, the two inner home signals for eastbound and middle platforms PJ3/500 and PJ4/600 act as both a semi-automatic or a draw up signal depending on the route set on the adjacent platform thus protecting the converging junction ahead. For instance if a train has a green on the EB, the train behind that has a green at PJ2 (routing signal) with a route to the middle platform, PJ4/600 will act as a draw up and the train will need to just about stop before being allowed to proceed.
Also, on the WB, there is a traditional 10 MPH draw up signal PJ320 (10MPH) halfway down the platform. Again, if there is a reverser in the middle with the route set WB, the draw up will require the train to slow right down. So yes, thinking the signal will clear because it always does is not what you want to be thinking!
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Deleted
Deleted Member
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Post by Deleted on Aug 9, 2016 16:16:15 GMT
I have also heard that there is a low rail adhesion area around Arnos Grove (I think coming out of the pipe on the eastbound (approaching A904) is one). This could have an effect, although don't take my word for it.
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Post by rheostar on Aug 9, 2016 16:34:24 GMT
I have also heard that there is a low rail adhesion area around Arnos Grove (I think coming out of the pipe on the eastbound (approaching A904) is one). This could have an effect, although don't take my word for it. Coming out of the tunnel eastbound from Bounds Green to Arnos Grove is uphill so there's no problems with rail adhesion. The first signal out of the tunnel is PJ1, not A904 which is on the westbound. One of the problems with A904 is that drivers don't react soon enough to R904 if it's on. They come down the hill from Southgate, see R904 with a yellow aspect, but don't immediately start braking, hence the number of SPaDs at that signal. |
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Deleted
Deleted Member
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Post by Deleted on Aug 9, 2016 16:53:20 GMT
I have also heard that there is a low rail adhesion area around Arnos Grove (I think coming out of the pipe on the eastbound (approaching A904) is one). This could have an effect, although don't take my word for it. Coming out of the tunnel eastbound from Bounds Green to Arnos Grove is uphill so there's no problems with rail adhesion. The first signal out of the tunnel is PJ1, not A904 which is on the westbound. One of the problems with A904 is that drivers don't react soon enough to R904 if it's on. They come down the hill from Southgate, see R904 with a yellow aspect, but don't immediately start braking, hence the number of SPaDs at that signal. Ooops, sorry, you're right of course, I was thinking coming out of the westbound tunnel from Southgate. Got that short section of tunnel confused with the main pipe through the city. |
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Post by rummer on Aug 11, 2016 15:58:05 GMT
A904 if you miss the R904 and come out of the tunnel doing 30mph plus in the rain its a spad all day..
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Post by rheostar on Aug 12, 2016 7:25:40 GMT
A904 if you miss the R904 and come out of the tunnel doing 30mph plus in the rain its a spad all day.. When I didn't have gray hair and used to be a trainer, I'd always tell trainees that if R904 was on start braking immediately. If they didn't... |
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