D, Canons Park then? It's somewhere up that way I think. This whole set is proving difficult or everyone's lost interest! Is the link that they all start with Can...? The 5th would be which of the 5 such Tube stations isn't pictured.
I thought the new crossover at Paddington would allow trains to terminate at Royal Oak and head back east?
It will. Apparently trains will be able to reverse East to West in Paddington 16. And West to East from Royal Oak WB or from a limit of shunt between Paddington and Royal Oak. For this latter, the passenger trip would finish at Paddington.
My experience is that D stocks were slower at platforms than C or S when there are a lot of passengers getting off and on. Flow wasn't much better than 4 standard single doors. Nice and cheap to build though which was important at the time. D stock was specified at a time of falling ridership. The train is just 111m long replacing 'R' stock which some years earlier had been running as 8 car trains about 128m long. S7 is almost 119m.
There are a number of anomalies when it comes to S Stock destination codes including a code that takes you from Edgware Road to Barking via Victoria, train describes itself as a District line train, and the opposite a train from Barking to Edgware Road via Victoria is described as a Circle Line train. On weekend Engineering works, when the Hammmersmith and City line is part suspended from Liverpool St to Barking, and for them to terminate at Aldgate, the only code for an Aldgate terminator is a Circle line one.
Others that would need to be added would be for Circle and H&C trains to be able to terminate at Paddington (Suburban) and remove Park Royal, all ready for the new signalling system.
Those EDR / BKG trips were specially crafted to keep all the LUL Stakeholders happy(ish) and off each others' metaphorical throats! There is correctly, no H&C trip to Aldgate. Not pink on the Tube Map of course. The extra trips like to Paddington (Suburban) and others for the new signalling system are worked out and will be added.
As far as I am aware, nothing other than tread brakes were ever considered. S stock is all axles motored and the overwhelming majority of braking is carried out using the dynamic brake (regenerative and/or rheostatic, so the friction brake hasn't much work to do. I'm sure T697 will be along with chapter and verse.
S stock has excellent wheelslide protection and automatic sanding is due to be commissioned for the coming autumn.
The brake blocks are not cast iron and cast iron hasn't been used on LU passenger stock for a very long time. Composition brake blocks are used, and before anyone asks, asbestos in composition brake blocks was discontinued in 1984
By the way, the newer Siemens trains (class 700 and 707, and, I presume the forthcoming class 717) have tread brakes on the motor cars.
I hadn't noticed this thread until recently. Yes a good summary on S stock. I seem to recall disc brakes were only considered briefly back at the concept stage. The weight and rotating inertia of discs wasn't thought worth it set against the light friction brake duty in normal service. 10 years onwards one might think about that again for various reasons, but probably would still settle on tread brakes I suspect. It will be interesting to see which way the New Tube for London (NTfL) or Deep Tube Upgrade (DTUP) trains go on this. I think LUL stopped having any asbestos in the brake blocks way back in the 1970s. The changes in the 1980s were to stop using silica.
It would be technically easy to change some or all of the WB H&C trips in the S stock CIS to start from Upminster rather than Barking, well within the memory and equipment capacity. There is no instruction to deliver any of this at the moment. Trains starting from Barking etc would just pick up the same 'trip' so there's no need for extras. The post that mentioned lack of 'joinedupness' has a point! You'd still have an issue with H&C trains that go on to stable at Upminster though. The relevant LU marketing related department doesn't like trains going away from central London to claim to be Circles or H&C except when on bits of line coloured yellow or pink on the public Tube Map. I understood too that Operators don't like driving a train that is claiming to provide a service for another line? Perhaps that sort of barrier is not actually real?
Regarding now redundant 'trips' such as the now unusable Hornchurch reversers etc. etc., they will be removed at a suitable update.