Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 10, 2005 17:41:02 GMT
What is the linespeed on the Victoria Line?
I'm not interested in how fast the codes will let the train go, I'm just curious as to what the basic linespeed is.
|
|
towerman
My status is now now widower
Posts: 2,880
|
Post by towerman on Sept 10, 2005 19:23:39 GMT
Most areas 35-40mph,in high speed areas ie:F/PK-S/S,HBY-K/X and S/W-BN trains can reach 47.5mph before the ATO speed check comes in.
|
|
Tom
Administrator
Signalfel?
Posts: 4,098 
|
Post by Tom on Sept 10, 2005 20:52:38 GMT
At Victoria recently we had trains coming in SB at 44mph. Signalled speed on the line (overlaps and stuff, not code) is generally 57mph.
|
|
|
|
Post by tom2506 on Sept 10, 2005 21:00:52 GMT
Does that mean their entering the platform at 44?
|
|
|
|
Post by Christopher J on Sept 10, 2005 21:03:45 GMT
At Victoria recently we had trains coming in SB at 44mph. Signalled speed on the line (overlaps and stuff, not code) is generally 57mph. That reminds me, about 2 weeks ago I travelled between Green Park and Victoria SB for the first over in over a month or two, the Train really did feel like it didn't want to stop motoring and it felt much faster than the last time I went over the part of the line, this was especially noticeable as the Train traversed over the points north of Victoria station. Have Metronet edited the speed limit on the part of the track concerned by any chance? Does that mean their entering the platform at 44? If that is the case, then that's way too fast to enter a Platform on the Victoria Line, as far as I'm aware the fastest entrance on the line is Kings Cross SB and that's only around a 35mph entrance. |
|
|
|
Post by tom2506 on Sept 10, 2005 21:22:51 GMT
On the Vic does it ever feel like the train suddenly needs to apply full brakes?
|
|
Tom
Administrator
Signalfel?
Posts: 4,098
|
Post by Tom on Sept 10, 2005 22:00:45 GMT
At Victoria recently we had trains coming in SB at 44mph. Signalled speed on the line (overlaps and stuff, not code) is generally 57mph. That reminds me, about 2 weeks ago I travelled between Green Park and Victoria SB for the first over in over a month or two, the Train really did feel like it didn't want to stop motoring and it felt much faster than the last time I went over the part of the line, this was especially noticeable as the Train traversed over the points north of Victoria station. Have Metronet edited the speed limit on the part of the track concerned by any chance? There was a mod done on that section so that trains wouldn't coast, but it was taken out again about three weeks ago. The 44mph figure I quoted was the speed over the points. Does that mean their entering the platform at 44? No, they were going over the points approaching the station at that speed. |
|
|
|
Post by igelkotten on Sept 10, 2005 23:54:44 GMT
There was a mod done on that section so that trains wouldn't coast, but it was taken out again about three weeks ago. Was that after the cant deficiency rate of change thing? |
|
Tom
Administrator
Signalfel?
Posts: 4,098
|
Post by Tom on Sept 11, 2005 11:41:27 GMT
Yes.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 11, 2005 20:14:26 GMT
On the Vic does it ever feel like the train suddenly needs to apply full brakes? I used the Vic daily for 6 months in 1998 and the stopping performance varied wildly between trains, I've known them to feel as if they are going to overshoot, then stand on their nose. I've also seen them pull up short. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 12, 2005 11:25:50 GMT
I used the Vic daily for 6 months in 1998 and the stopping performance varied wildly between trains, I've known them to feel as if they are going to overshoot, then stand on their nose. I've also seen them pull up short. What doesnt help, is that at some stations the train aims to stop at the headwal,, as was the case when the line opened, and trains did stop at the headwall, now with all the OPO stuff, the train has to stop a bit short of the headwall, it is sometimes neccessary to 'help' the train to stop a bit quicker. Some drivers, seems to like to kosh it at the end, rather than just giving more EP and or dropping a little bit of train line air. |
|
Tom
Administrator
Signalfel?
Posts: 4,098
|
Post by Tom on Sept 12, 2005 15:19:51 GMT
What doesnt help, is that at some stations the train aims to stop at the headwall, as was the case when the line opened, and trains did stop at the headwall, now with all the OPO stuff, the train has to stop a bit short of the headwall, it is sometimes neccessary to 'help' the train to stop a bit quicker. I have heard this suggestion a number of times before and I will reiterate what has been my standard reply: The overshooting is not because the train is aiming for the headwall but because of the tolerances in train performance in braking and the fact that if the train misses the early braking spots it has to stop without the DTG facility, which is inherently less accurate. The stop marks are still situated in their original locations (except Victoria SB), generally 10ft 6in from the headwall, and this is the point that trains aim to stop at. (OPO equipment was provided on the line from oening and was generally monitors positioned for the T/Op to look back and up from the cab when stopped at the stop mark). |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 12, 2005 18:03:51 GMT
The stop marks are still situated in their original locations (except Victoria SB), generally 10ft 6in from the headwall, and this is the point that trains aim to stop at. (OPO equipment was provided on the line from oening and was generally monitors positioned for the T/Op to look back and up from the cab when stopped at the stop mark). Going back quite a few years. The Vic platforms had a series of about 10 red lines about a foot apart, painted on the nosing stones from the headwall, my guess was these were to gauge the stopping, so as to tweak the braking codes, correct me if I am wrong on that. Are these still there, it's been a few years since I have traveled on the Vic? |
|
Tom
Administrator
Signalfel?
Posts: 4,098
|
Post by Tom on Sept 12, 2005 18:42:27 GMT
They aren't there any more, or at least I've never seen them. What is still there is the arrow positioned 411 feet from the rear headwall.
|
|
