damerell: (trains)
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posted by [personal profile] damerell at 08:21pm on 01/06/2010
I've been playing Railworks, a train driving simulator, which is very jolly - albeit I notice perhaps targetted at slightly harder core enthusiasts than me (if I spend 55 minutes driving an HST from Paddington to Oxford I would like a more eventful journey than stopping at Reading [1] and being slowed by signals for two moves onto a slower speed track) - and am gently contemplating the steam locomotive controls [2] and the Engine Driver's Handbook.

However, something I don't really understand is this; a caution signal is described, almost everywhere, with the vague term "be prepared to stop at the next signal". Is there any convention for what signal spacing is so that you know, say, on a 125mph line you will have to decelerate to 40mph for a caution signal, or is this all down to route knowledge?

This is made trickier by the way that you can't really see signals very well a long way off and at night, light signals facing the other way bloom a bit from the back (gah). This isn't so bad - the game HUD tells you about the next signal, which would be too easy unless you (in the interests of sportsmanship) require yourself to actually spot it before taking action.

[1] Unlike (Open)BVE it doesn't really care if you stop in the wrong place - the last carriage, with all the posh people in, was hanging off the platform. Tee hee, but must try harder.

[2] An enormous improvement over Trainz, which had a serious case of virtual cockpit syndrome - there's no HUD with the state of all the controls and instruments on a steam locomotive (sure, a real one doesn't have one, but a real one has two sets of eyes who don't have to fiddle with the mouse to look around them) and one of the controls has no keyboard shortcut and can only be controlled by mouse tugs - nothing important, I think, just something like the regulator or the reverser [3].

[3] for non-nerds this is a JOKE and both these controls are very important.
There are 3 comments on this entry. (Reply.)
ext_267968: bjh (Default)
posted by [identity profile] bjh21.me.uk at 08:52pm on 01/06/2010
The standard for signal spacing appears to be GK/RT0034 (http://www.rgsonline.co.uk/Railway_Group_Standards/Control%20Command%20and%20Signalling/Railway%20Group%20Standards/GKRT0034%20Iss%204.pdf). This sets the minimum distance from the first caution signal (single-yellow for three-aspect signalling, double-yellow for four-aspect) to the stop signal based on the principle that if you're running at the permissible speed and start braking at the first caution signal you should stop in time. It also restricts the positioning of single-yellow aspects in four-aspect areas and imposes a maximum signal spacing (usually 1.33 times the minimum, but can be up to twice the minimum). This suggests that you can get a rough idea of the signal spacing from the linespeed, but you'll need some route knowledge to avoid accidentally stopping too early.
ext_267968: bjh (Default)
posted by [identity profile] bjh21.me.uk at 08:53pm on 01/06/2010
Ahem. Apologies for the wonky subject
damerell: (trains)
posted by [personal profile] damerell at 01:16pm on 02/06/2010
That's very helpful, thanks. I can use "route knowledge" in the form of the HUD to know if the next signal is unusually far away, which deals with that.

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