|
|
Post by A60stock on Nov 16, 2017 18:04:22 GMT
Few queries
1. Why was the 1973 stock the only stock to be given dot matrix indicators on both the inside and outside of the train, but the 72, 67, a and c stock retained the roller blinds? (Bearing in the mind the 92 stock was given dmis externally as new)
2. Why could a train not be run as a half refurbished and half unrefurbished stock? E.g A stock were formed of 2 4 car units, but no mixing was ever done
|
|
|
|
Post by superteacher on Nov 16, 2017 18:18:46 GMT
2. Why could a train not be run as a half refurbished and half unrefurbished stock? E.g A stock were formed of 2 4 car units, but no mixing was ever done Something to do with incompatible electrics? |
|
|
|
Post by t697 on Nov 16, 2017 19:17:03 GMT
It was indeed why you couldn't operate a mixed pre/post refurb train. I seem to recall A stock retained Passenger Alarms that vented the Train Line (Brake Pipe) directly, while the A stock Refurb had the Passenger Alarms in an electric circuit so the T/Op could override the brake application and proceed to the next station. That was definitely the case with C stock pre and post Refurb.
And on the specifications of Customer Information Systems for the various fleets; The ones refurbished before the 1973TS were generally not intended to have a residual life of much more than around 10 years at the time, so just the minimum of adding the automated audio announcements was done. In the case of A stock, not even that. 1972TS is being forced to last longer than expected and I think there is a project to update the CIS to an RVAR compliant system.
By the time of 1973 TS Refurb, the RVAR regs were coming into force for new build and LU wanted to do their best with older trains to be close to compliance. 1973TS was seen as still having a relatively long residual life - and is now having to last even longer! Hence the more extensive system. The cab front displays were originally Liquid Crystal Display type on Refurb. They didn't last very well and have more recently been replaced by LED dot matrix type which to me look better as well. Not as clear as a roller blind though.
|
|
|
|
Post by A60stock on Nov 16, 2017 20:04:42 GMT
Do RVAR require the front destination to be a dmi? That would explain why the other stocks didnt get one (and why the 72ts still has them)
On reading your answer, it also makes me wonder why the a stock was the ONLY stock refurbished not to receive any audio announcements?
Cant say im not happy that it didnt happen!
|
|
Chris M
Global Moderator
Forum Quizmaster
Always happy to receive quiz ideas and pictures by email or PM
Posts: 19,394
|
Post by Chris M on Nov 16, 2017 21:35:12 GMT
Do RVAR require the front destination to be a dmi? No. The RVAR 2010 simply requires there to be a "display", which is defined as "a screen fitted to the exterior or interior of a rail vehicle which is used to indicate the destination or route number of a rail vehicle, or make other visual announcements, which forms part of a public address system for visual announcements; " Interestingly, it appears that a front display is always mandatory for single vehicles, but is optional in multi-vehicle trains if there are displays on both sides of the train. Regardless of length, the train does not need exterior displays if there are visual displays giving the destination at every station the vehicle calls at. |
|
|
|
Post by MoreToJack on Nov 16, 2017 23:20:18 GMT
It should be remembered that the 1972 stock had their destination blinds changed a few years ago from all upper case to the mixed case (and some silly abbreviations) now used - there was also another variation during a brief trial period. The new blinds are RVAR (and TfL standard) compliant.
|
|
|
|
Post by superteacher on Nov 17, 2017 8:59:34 GMT
It should be remembered that the 1972 stock had their destination blinds changed a few years ago from all upper case to the mixed case (and some silly abbreviations) now used - there was also another variation during a brief trial period. The new blinds are RVAR (and TfL standard) compliant. There is at least one until which still retains the upper case versions. |
|
