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Post by jreece on Mar 29, 2006 14:06:23 GMT
Hi all. I've been using the BVE sim of the Northern Line a lot lately and it's raised a few questions that I guess someone here will be able to answer so here goes  As you may know, at each station stop, the sim tells you exactly how far you are from a 'zero' point bang on the centre of the stopping mark. I was wondering what is the acceptable limits in which the train should be stopped? (e.g. the distance +/- the middle of the stopping point beyond which an adjustment would be made or the station be considered as overshot) Secondly, what's the reason for so many stations (including at least one that's above ground, as I recall) being built on sometimes quite severe humps? I'm guessing there's an obvious practical reason beyond trying to make it awkward for the train op by changing the levels of momentum experienced halfway down the platform  Jeremy |
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Post by Deleted on Mar 29, 2006 14:12:09 GMT
On stopping marks, as I understand it, if the black line on the stopping board is within the small windows either side of the cab (the one in front of the cab doors), the Correct Side Door Enable is activated and they will open. I believe that stopping with the black line outside the window disables this.
As for humps in stations one method of slowing trains down and easing acceleration in the early days of tube railways was to build stations with this principle. The upper hump slowed it down and reduced brake use, and the lower one speeded the train up on departure.
I know what you mean, the most extreme example on BVE being Tufnell Park.
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Post by jreece on Mar 29, 2006 14:22:31 GMT
Thanks. So if the black line is in the centre of the window, BVE will show about +0.6m, so an 'acceptable' range would be between (say) about +0.45 and +0.75... Not that easy if the stopping mark's on the right though :/ because you can't see the window and the perspective would be different even if you could. I guess the thing about humps is common sense really but it seems to require a totally different approach to the braking because the slowing affect of the rise cancels out as you get closer to the stopping marker. If I'm gonna overshoot, you can bet it'll be one of those  |
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Post by Deleted on Mar 29, 2006 14:32:38 GMT
On BVE the most difficult station to stop at (for me) is Hampstead SB (I know there isn't a NB on BVE). I have found that stopping with the black line around what would be the middle of the window doesn't give a 0 reading, but as that's where they stop in real life I stop there anyway. However on 1938 stock I find it hard to gauge where the 7 car stop diamond would be.
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Phil
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RIP 23-Oct-2018
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Post by Phil on Mar 29, 2006 15:05:11 GMT
On BVE the most difficult station to stop at (for me) is Hampstead SB (I know there isn't a NB on BVE). I have found that stopping with the black line around what would be the middle of the window doesn't give a 0 reading, but as that's where they stop in real life I stop there anyway. However on 1938 stock I find it hard to gauge where the 7 car stop diamond would be. Yeah - hampstead - luvverly!!! Almost always miss it!! AFAIK (one of the experts will correct me later if I'm wrong) the stopping marks are designed as they would be if you looked straight out of a SIDE window of the cab. Once you get the hang of this idea the rest becomes easy (with practice). As for the humps, they not only aid acceleration/deceleration but save on electricity AND speed up the service frequency. Not bad for a really old idea! |
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Post by Tomcakes on Mar 29, 2006 18:05:51 GMT
The default tolerance is +/- 5m, IIRC (don't quote me though).
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Phil
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RIP 23-Oct-2018
Posts: 9,473
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Post by Phil on Mar 29, 2006 18:11:05 GMT
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Post by Deleted on Mar 29, 2006 18:41:15 GMT
Yup - in fact, what I've taken to doing is, actually moving my head as if I'm looking out of the side cab window, to gauge if I'm right on the mark or not - seems to work for me usually.
Interestingly, I switched the 95 for the 72mk I, and I stopped almost perfectly each time (apart from S Wimbledon, IIRC), unlike me usually in the 95, when I overshoot a few times usually. I think it's due to the braking strength and positions.
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Post by Tomcakes on Mar 29, 2006 19:44:41 GMT
It is actually possible to set the tolerance to whatever value you want in BVE4 - but then people would be rather stuck . |
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Post by Deleted on Mar 29, 2006 20:43:10 GMT
It's the view of the black line out of the side window as you are sitting back in your seat as per usual! Not leaning anywhere!
Sam
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