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Title: New build standards Post by: grahame on November 01, 2015, 19:03:19 What are the new build standards for platform lengths? 3 car train at 23 metres / carriage calculates out at 78 metres, but what extra allowance is required for pulling up inaccuracies, or may be taken off to allow for doors not quite at end of carriages? What about allowing for future carriage lengths of up to 26 metres?
Title: Re: New build standards Post by: stuving on November 01, 2015, 19:37:02 What are the new build standards for platform lengths? 3 car train at 23 metres / carriage calculates out at 78 metres, but what extra allowance is required for pulling up inaccuracies, or may be taken off to allow for doors not quite at end of carriages? What about allowing for future carriage lengths of up to 26 metres? I think the answer is "yes, you are right". The official standard (GT/RT 7016) says: Quote 5.1 General requirement for usable length of platforms There follow a number of let-outs and work-rounds for short paltforms.
But where (you reply) are the actual numbers involved specified? They are not in any standard, but to be determined on a case-by-case basis. There is also a TSI (2008/57/EC), for high-speed lines, but in this case it is pretty much common sense. Quote 4.2.10.1. Usable length of platforms All TSI categories of line (1) The platform length shall be sufficient to accommodate the longest interoperable train intended to stop at the platform in normal service. When determining the length of trains intended to stop at the platform, consideration shall be given to both the current service requirements and the reasonably foreseeable service requirements at least ten years following the bringing into service of the platform. (2) It is permissible to build only the length of platform required for the current service requirement provided passive provision is made for the reasonably foreseeable future service requirements. (3) The usable length of a platform shall be declared in the Register of Infrastructure. Title: Re: New build standards Post by: Chris from Nailsea on November 01, 2015, 19:41:12 But where (you reply) are the actual numbers involved specified? They are not in any standard, but to be determined on a case-by-case basis. So, just how long is a piece of string, anyway ... ::) ;) ;D Title: Re: New build standards Post by: Visoflex on November 02, 2015, 09:00:58 Quote So, just how long is a piece of string, anyway ... ::) ;) ;D Twice half its length - obviously! Title: Re: New build standards Post by: stuving on November 02, 2015, 09:56:44 Quote So, just how long is a piece of string, anyway ... ::) ;) ;D Twice half its length - obviously! But not twice the length of two pieces of string half as long, joined by a knot. Title: Re: New build standards Post by: Tim on November 02, 2015, 11:15:09 What about allowing for future carriage lengths of up to 26 metres? Is this a general trend or just the IEPs? Title: Re: New build standards Post by: broadgage on November 02, 2015, 11:57:30 I suspect that 26M vehicles may be a long term trend.
Considerable expense and trouble is involved in clearing a route for 26M vehicles. Having spent all that money, it would seem reasonable that future builds of suburban trains or even new sleeper stock might well be 26M. Within reason, longer rail vehicles are better, fewer bogies to maintain, fewer gangway connections to maintain, fewer air conditioning units to maintain. And less space in percentage of total train length is wasted in doorways, vestibules, and gangways between vehicles. (I have previously expressed doubts about the IEPs, but it is NOT the longer vehicles to which I object, longer is better within reason) Title: Re: New build standards Post by: grahame on November 02, 2015, 12:03:24 I am thinking that an 85 metre platform for services which may go up to 3 coaches is about right for the future. That's 3 x 26 metres plus 7 metres "wobble" on stopping.
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