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| accurate LE speeds 27/09/2012 at 15:41 #35864 | |
jc92
3629 posts |
an idea discussed by myself and pascal (58050). light engines will run at variable speeds, dependent on what the line speed is. eg if 100mp+ they can run up to 75mph. if under 100mph they are limited to 60 etc. the trouble when timetabling light locos is setting a max speed. i use 60mph by default, however if a loco then runs over a fast line, it will never run at "full" speed, conversely a LE booked at 75mph over a slow line will be speeding. is it possible to add light loco as a train characteristic, like loco hauled or MGR, so that such trains will be subject to rules correcting their speed depending on the linespeed of the track they are currently on? Joe "We don't stop camborne wednesdays" Log in to reply |
| accurate LE speeds 27/09/2012 at 16:20 #35866 | |
sparplu
18 posts |
The correct speed for light locos is if line speed is above 85mph then light engines can go 75mph and below 85mph its 60mph.
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| accurate LE speeds 27/09/2012 at 16:53 #35869 | |
headshot119
4869 posts |
" said:The correct speed for light locos is if line speed is above 85mph then light engines can go 75mph and below 85mph its 60mph.If we're going to be pedantic: If the line speed is 90MPH or more maximum speed is 75MPH. If the line speed is 85MPH or less maximum speed is 60MPH. "Passengers for New Lane, should be seated in the rear coach of the train " - Opinions are my own and not those of my employer Log in to reply |
| accurate LE speeds 27/09/2012 at 17:02 #35870 | |
58050
2650 posts |
You are quite right right Karl.
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| accurate LE speeds 27/09/2012 at 18:18 #35875 | |
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Sacro
1171 posts |
Surely you can just go by headcode? 0xxx should always be a light loco (except for 0B00)
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| accurate LE speeds 27/09/2012 at 18:51 #35877 | |
Steamer
3920 posts |
Stupid question, but: Why are light engine speeds restricted to less than line speed/max speed for that class of loco? "Don't stress/ relax/ let life roll off your backs./ Except for death and paying taxes/ everything in life.../ is only for now." (Avenue Q) Log in to reply |
| accurate LE speeds 27/09/2012 at 19:04 #35878 | |
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58050
2650 posts |
Because of the braking character restricts of a loco on its own as opposed to a loco hauling a train. A loco hauling a train also has the train brakes to slow it down or stop whereas an engine on its own only has itself.
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| accurate LE speeds 27/09/2012 at 21:23 #35883 | |
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Danny252
1461 posts |
I would suspect stability comes into it somewhere, too? I certainly know that LEs have restrictions for that reason on the other side of the pond.
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| accurate LE speeds 27/09/2012 at 22:33 #35884 | |
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Underwood
746 posts |
This also counts for any loco with 5 or less coaches/wagons does it not, or is it 4 or under? I've known some short rakes carrying empty wagons along just for the sake of having extra brake force. Log in to reply The following user said thank you: Steamer |
| accurate LE speeds 27/09/2012 at 23:52 #35889 | |
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Aaron86
25 posts |
The "problem" concerned LE is they are much heavier than a wagon, so brakes have less effort and needs more space to stop.
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| accurate LE speeds 28/09/2012 at 07:41 #35891 | |
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Albert
1313 posts |
Also locos like the Class 66 (or at least the ones in the Netherlands) only have brake pads on a few wheels, making things even worse.
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| accurate LE speeds 28/09/2012 at 08:36 #35892 | |
postal
5190 posts |
Believe me, it is scary when you are in the cab of a LE or one on a short train when the driver puts the brake handle over and nothing appears to happen!
“In life, there is always someone out there, who won’t like you, for whatever reason, don’t let the insecurities in their lives affect yours.” – Rashida Rowe Log in to reply |
| accurate LE speeds 28/09/2012 at 09:09 #35893 | |
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58050
2650 posts |
It's all to do with brake force. Speed restrictions are as follows:- Any number of locos running light engine can run at 75mph if the line speed is 90mph or above, 60mph if the line speed is 85mph or less. 1 or 2 locomotives with 1, 2 or 3 vehicles can run at the same speeds as listed above for light locomotives. 1 locomotive with 4, 5 or 6 vehicles may run at 90mph if the line speed is 100mph or above, 80mph if the line speed is 90 or 95mph & 75mph if the line speed is 80 or 85mph. 2 locomotives & between 4 to 10 vehicles the same speeds apply as those listed for 1 locomotive with 4, 5 or 6 vehicles. Freight trains are slightly different as they would be restricted to the speed of the slowest vehicle in the consist. Log in to reply The following user said thank you: Steamer |
| accurate LE speeds 28/09/2012 at 11:42 #35895 | |
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headshot119
4869 posts |
" said:It's all to do with brake force. Speed restrictions are as follows:-Except of course if it's a Class 67 hauling four or more Mark1, Mark2, Mark3 Sleeper, or postal vehicles. I also think, but I'm sure 58050 will correct me that you don't have to comply with those speeds if it's MK4 vehicles you are hauling? "Passengers for New Lane, should be seated in the rear coach of the train " - Opinions are my own and not those of my employer Last edited: 28/09/2012 at 17:54 by headshot119 Log in to reply The following user said thank you: Steamer |
| accurate LE speeds 28/09/2012 at 15:19 #35898 | |
GeoffM
6281 posts 
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So the original requirement for two limiting speeds for light engines has now expanded to all sorts of factors. :blink: Severe case of requirements creep - or badly formed requirements, depending how you look at it! 
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| accurate LE speeds 02/10/2012 at 11:40 #35968 | |
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clive
2737 posts
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Added to the bug tracking system as 7678. Don't hold your breath, though.
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