| Topic: | Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Re:Turnham Green Tube | |
| Posted by: | Michael Robinson | |
| Date/Time: | 03/12/25 13:32:00 |
| "A speed limit implemented in a way that would not impact the timetable" Piccadilly line working timetables give a distance of 4.41km between Hammersmith and Acton down and timetabled non-stop running times of 6 minutes eastbound and 6.25 minutes westbound. That means an average speed of 44.1 kmph eastbound and 42.3 kmph westbound. By definition, the trains need to have these average speeds not to impact the timetable. If the average speed is slower, the time is longer and the entire timetable would need to be revised with new timings. How are you suggesting this happens? Would the trains accelerate to faster than their current speed between Hammersmith and Turnham Greem, then decelerate to slower than their current speed at Turnham Green then accelerate again to faster than their current speed between Turnham Green and Acton Town? What would you consider a "safe" speed for trains to pass through Turnham Green? Let's say it is about double walking pace of 10kmph for 500m going through Turnham Green, then some back of the envelope calculations show the train would need to achieve maximum speeds of over 150kmph before and after Turnham Green in order to maintain the same average speed and running time to maintain the current timetable. "I'm struggling to understand why this isn't at least worth investigation." I think your struggle to understand this says more about your analytical thinking ability than London Underground management. Feel free to do your own calculations. |