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| Braking distances | ||
|---|---|---|
| 17:18, 26 February 2010: | Report | Quote | |
| PIS-Artist Member 
Send a message Joined: Apr 2009 Posts: 33 |
I know all the official group standard braking distances, what I am after is how long (time) or how far (distance) a typical brake applicationis take when making a station call under normal circumstances from various linespeeds (i.e. using defensive driving techniques in normal conditions without spilling the punters coffee). I ask this as I am involved in improving various passenger information systems and there is a requirement to play the "now approaching" message 2 minutes before the doors open. So in order to make a good practice guideline I need to know typical braking rate drivers use. all help is greatly appreciated. I'm interested in passenger information systems, old and new. PM me if you notice anything bizzare on the trains out in the real world. | |
| 00:07, 27 February 2010: | Report | Quote | |
| O L Leigh Member 
Send a message Joined: Jul 2005 Posts: 752 |
You have to be kidding!! Two minutes...? That's the timetabled distance between most stops on our inner-suburban routes. As for other stations, it's such a random figure to be applied and hardly reflects the actual operation of the railways. The "now approaching" for Stansted Airport plays just after the train gets onto the airport branch and some considerable distance before the last signal protecting the entrance to the tunnel. Some of our services are timetabled to wait at that signal for up to 4 minutes before getting the road through "the pipe", and even then there are two further opportunities for the signaller to hold you outside of the platform. And yet at other stations you don't get the "now approaching" until you are already at least halfway along the platform and almost on top of the stop board. Given that most PIS systems are GPS based, a more logical solution would be to place the trigger point just beyond the last signal before the station itself irrespective of the time it takes to cover this distance. There will have already been a "next station is" announcement at the previous stop and the information is repeated on the the screens, so those people expecting to leave the train at that station will have already been alerted to the fact that they need to be ready to alight. However, the big benefit is that you would only get the "now approaching" when the train is actually about to stop in the appropriate platform rather than having the embarrassing situation of it playing on approach to a red that you could potentially be sitting at for a good number of minutes. Incidentally, while I've got your attention... Every time the TT changes they tinker with our PIS and mess it up. The most recent updates for the Dec TT change meant we lost all our "please change here for" announcements and the trigger point for WA service approaching Stratford from the direction of Tottenham Hale. Is there any chance you could have a word in the appropriate ear? Cheers. O L Leigh Limited blog archive: Click Some railway pics: Click  | |
| 11:22, 11 March 2010: | Report | Quote | |
| Mr.Chips Member Send a message Joined: Jul 2009 Posts: 181 |
Not read this topic fully buit through seeing an article in TRUK Magazeen reagrding a Crash at I think Leeds Station Invoving a 142 Unit running in to the back of a Class 90. It is apreant thyat the 142 Unit was doing 30mph coming into the statuion but skidded when braking through slippery track but what puzzles me is why would a train of any type stopping at a Station be allowed to do 30mph through in to the platform. As surley ity would be safer if the speed was reduced to about 15mph to avoid such acidents espeicaly in the case of a 142 unit with no sandite or WSLP equiptment. | |
| 18:10, 11 March 2010: | Report | Quote | |
| LM Driver Member Send a message Joined: Nov 2007 Posts: 100 |
It does depend on the railhead conditions. I can hit the end of a platform doing 35-40 MPH and stop on the stopboard. However in bad railhead conditions this would be much much slower as I would have breaked a lot earlier than nornal. It also deplends on the length of the platforms the length of the train, where the stopboards are on the platform and of course the line speed on the approach to the platform. Also if you were entering a platform under permissive working in which case I woud be doing 15 MPH. This is just my own opinion. | |