There are plenty of videos on Youtube of convoys of up to 12 class 66 locos and I wondered how braking worked in these situations. Do the dead locos still provide braking as wagons in a train would? Or do a few need to be left running to help out. Presumably the lead loco isn't left to slow down what would amount to a considerable amount of weight on it's own.
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Locomotive convoys
- Thread starter JMH77
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All the locos will provide the braking like any other train would...assuming all the vehicles have the automatic brake operative.
Brake force is the same whether subsequent locos are running, shutdown or connected in multiple.
Brake force is the same whether subsequent locos are running, shutdown or connected in multiple.
The light loco speed restriction is only if the line speed is 85mph or below and is because locos have poor brakes on their own but are very heavy.
Locos conveying more than 5 locos are classed as an exceptional load and thus run an X headcode.
Locos conveying more than 5 locos are classed as an exceptional load and thus run an X headcode.
I've always wondered why locomotives can't brake at the same rate as wagons and coaches, given that the interface is the same and locomotives should have at least as much axle loading and therefore down force. Could someone who knows please explain this?
Because the actual brakes on a loco are roughly the same size as a coaches brakes but the loco will weigh 3 or 4 times more than a coach.
edwin_m
Veteran Member
Aren't the brakes on modern locos (66s and 67s) able to provide the same deceleration as on coaching stock?
craigybagel
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Which is why 67s are exempt from the light loco speed limits aren't they?
Don't believe so, there is a note in the notice case at kings X regarding the speed limits applying to light 67 moves on the Lincoln, Cambridge and Hertford routes.
They are, I think those restrictions are more to do with the high axle loading of the locos rather than the brakes.
Fair enough. Will have to re-read the notice. Was sure it said something along the lines of 'normal light loco restrictions apply'.
As we know 'local' instructions can be a nightmare and sometimes seemingly without reason!
True. Plus my only knowledge of light locos is from reading this notice at kings x. Being that I'm
Not trained on LHS it's fair to say a little knowledge is a dangerous thing.
Not something I associate with you or your posts!
ExRes
Established Member
Way back 67s were classified differently in the rule book because of their superior braking ability, a 47 and 4 vans ran under restricted speeds whereas a 67 and 4 vans did not
We were, amusingly, told that the braking system of a 67 was so efficient that it could run light engine at 125mph, forgetting the fact that the 67s were such garbage they were still speed restricted when I last drove one at the tail end of 2000, it was noticeable that nobody from GM, Railtrack or EWS management volunteered to test the 125mph theory out
:roll:
We were, amusingly, told that the braking system of a 67 was so efficient that it could run light engine at 125mph, forgetting the fact that the 67s were such garbage they were still speed restricted when I last drove one at the tail end of 2000, it was noticeable that nobody from GM, Railtrack or EWS management volunteered to test the 125mph theory out
:roll:
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