DY444 Posted December 10, 2020 Share Posted December 10, 2020 (edited) 11 hours ago, St. Simon said: Hi Adrian, It’s a Block Marker, the cab signalling equivalent of a Lineside Signal. They are used for degraded mode working when the cab signalling (in this case CBTC, but could be ETCS or TVM430 systems*) fails. The Block Markers act as a location marker, so when the cab signalling fails, drivers are told to proceed to the next block marker from where they can pick the movement authority up again or be talked to the next block marker. They don’t really serve much of a purpose when the can signalling is working correctly. *The block markers for each system vary slightly in design. Simon No idea about ETCS but the block markers certainly serve a vital purpose in normal working on the manually driven TVM430 equipped lines as they provide a lineside reference to the driver for the commencement point of a lower permitted maximum speed. If there is a stationary train on a TVM430 line then another train approaching behind doing 300kph will receive a succession of decreasing maximum permitted speeds (something like 270kph, 230kph, 170kph, 80kph, 0kph). Each of those speeds will be applicable from a block marker and the driver has to ensure that the speed is not exceeded when the train reaches the marker concerned, and, in the case of 0kph the train must not pass the marker*. *Some markers are permissive and trains can pass those with a train in front under certain circumstances Edited December 10, 2020 by DY444 1 5 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted December 10, 2020 Author Share Posted December 10, 2020 21 hours ago, corneliuslundie said: I was going to joke that they did the run in the dark so we wouldn't notice the tunnels - then we entered one. (I assume it was to keep out of the way of other traffic on those lines in use.) .............. Running in the dark wouldn’t be to avoid other traffic, as Abbey Wood to Westbourne Park is all on separate, dedicated Crossrail lines. . 2 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted January 28, 2021 Author Share Posted January 28, 2021 1 2 Link to post Share on other sites More sharing options...
RMweb Premium corneliuslundie Posted January 29, 2021 RMweb Premium Share Posted January 29, 2021 Are the wider staircases to cater for more obese passengers?!!! I don't quite understand why so much work at the stations was needed though. Was it a convenient way of getting the work funded within a larger package where the cost would be a small fraction of the total and not noticed? And I hope that these new buildings last better than many of those built by BR (and others) in the 1960s. Jonathan Link to post Share on other sites More sharing options...
Mike Storey Posted January 29, 2021 Share Posted January 29, 2021 11 hours ago, corneliuslundie said: Are the wider staircases to cater for more obese passengers?!!! I don't quite understand why so much work at the stations was needed though. Was it a convenient way of getting the work funded within a larger package where the cost would be a small fraction of the total and not noticed? And I hope that these new buildings last better than many of those built by BR (and others) in the 1960s. Jonathan The stations are being re-built to meet the standards of accessibility required by CrossRail (and which will therefore be partly funded from the national Access for All scheme), hence lifts and new footbridges for same where necessary, which will have been built to modern specs. Another reason is to expand those where a much higher footfall is expected - many of them had not been re-built since the 19thC. - and where new ticket gates will be necessary. One other important reason for some of them is to improve interchange with other forms of transport, such as buses, bicycles and even walking, to make the likelihood of people leaving their cars at home more probable. Whether they will last better than those of early BR days is anyone's guess. 3 1 Link to post Share on other sites More sharing options...
2750Papyrus Posted January 30, 2021 Share Posted January 30, 2021 Do the specifications not address issues such as durability and maintainability? 1 Link to post Share on other sites More sharing options...
2750Papyrus Posted January 30, 2021 Share Posted January 30, 2021 (edited) duplicated post for some reason Edited January 30, 2021 by 2750Papyrus Link to post Share on other sites More sharing options...
Mike Storey Posted February 1, 2021 Share Posted February 1, 2021 On 30/01/2021 at 12:46, 2750Papyrus said: Do the specifications not address issues such as durability and maintainability? I don't know for sure but would strongly suspect that maintainability will have been a written requirement in the specs. - that was standard 10 years ago. The building life span can only be guaranteed for 10 years (not including electricals etc) but it would be unusual for any railway contractor to take responsibility for any defects, other than very serious ones (such as structural failure, but even that would more likely be self-insured, as the contractor has no control over levels of vibration), for more than the snagging period, normally one year after handover. The building structure would normally have a write down value of 40 years. 1 1 Link to post Share on other sites More sharing options...
Zomboid Posted February 1, 2021 Share Posted February 1, 2021 Maintainability is a legal requirement under the "Construction (Design & Management) Regulations 2015" https://www.hse.gov.uk/construction/cdm/2015/index.htm It's pretty dry, but the essence is that if you don't consider how something will be maintained when designing it, you've broken the law. (Which also covers building it and taking it down at the end of its life). 1 1 2 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted February 15, 2021 Author Share Posted February 15, 2021 4 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted February 15, 2021 Author Share Posted February 15, 2021 Ealing Broadway Station (February 2021) 2 Link to post Share on other sites More sharing options...
lyneux Posted February 16, 2021 Share Posted February 16, 2021 Those new footbridges are super ugly. An act of architectural vandalism for most of the stations concerned. Happily Hanwell appears to have emerged relatively unscathed. Guy Link to post Share on other sites More sharing options...
Ron Ron Ron Posted February 16, 2021 Author Share Posted February 16, 2021 Crossrail Update. Preparing for Trial Running. https://www.crossrail.co.uk/news/articles/crossrail-project-update . 2 2 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted February 22, 2021 Author Share Posted February 22, 2021 . 2 1 1 Link to post Share on other sites More sharing options...
ess1uk Posted February 28, 2021 Share Posted February 28, 2021 Crossrail urged to delay schedule to ease ‘intense pressure’ on assurance workers. from New Civil Engineer Link to post Share on other sites More sharing options...
Shed Posted March 10, 2021 Share Posted March 10, 2021 Delayed enough already? Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 10, 2021 Author Share Posted March 10, 2021 4 hours ago, Shed said: Delayed enough already? Ultimately, it won't matter once it's ready and opened. Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 10, 2021 Author Share Posted March 10, 2021 The Central London stations are now being handed over to TfL. 2 already handed over with more to follow over the next few months. Worth a look.... Crossrail March Update.... https://2577f60fe192df40d16a-ab656259048fb93837ecc0ecbcf0c557.ssl.cf3.rackcdn.com/assets/library/document/c/original/completing_the_elizabeth_line-05_march_2021.pdf . Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 10, 2021 Author Share Posted March 10, 2021 Hanwell Station, sympathetically restored and updated for the Elizabeth Line. 5 Link to post Share on other sites More sharing options...
Mike Storey Posted March 11, 2021 Share Posted March 11, 2021 On 10/03/2021 at 08:19, Shed said: Delayed enough already? Well, yes. Although it does not matter anywhere near as much now, because forecasts suggest it will take a little while for demand to pick up again. But what it does do is spend more money, which could otherwise be being used to work up Crossrail 2, and that is now touch and go - that could be a problem ultimately. 2 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 20, 2021 Author Share Posted March 20, 2021 (edited) Acton Main Line - the new station building is now open. An aerial photo taken earlier, before the new facilities were completed. . Edited March 21, 2021 by Ron Ron Ron 2 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 20, 2021 Author Share Posted March 20, 2021 (edited) West Drayton (still under construction and due to be completed in the next couple of months)........ Edited March 21, 2021 by Ron Ron Ron 3 1 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 21, 2021 Author Share Posted March 21, 2021 Link to post Share on other sites More sharing options...
Ron Ron Ron Posted March 21, 2021 Author Share Posted March 21, 2021 (edited) I think this latest monthly update video from Crossrail is better than the regular PR fluff. It's brief, but there's no fluff and there are plenty of glimpses of the "virtually finished" article. . Edited March 21, 2021 by Ron Ron Ron 2 1 1 Link to post Share on other sites More sharing options...
RMweb Gold Oldddudders Posted March 21, 2021 RMweb Gold Share Posted March 21, 2021 In my day, a CEO tended to wear a tie..... 1 4 Link to post Share on other sites More sharing options...
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