Re: Dead hauling diesels

["Andrei Souprounovich" <andrei@ausisp.com>]

Aus loco discussion mailing list


----- Original Message -----
From: Stephen Molloy <c501@diesel.net.au>

> >Dead hauling a diesel electric is bad for the traction motors. Even if
> >you're double heading but don't need
> >all the horsepower, it's wise to have the second loco idling and offline.
> >The blowers keep the traction motors cool and dry, and you can easily
switch
> >the second loco in if the first one fails.
>
> Sounds like a load of rubbish.  Diesels are regualrly hauled dead without
> any problems, it wouldn't be done otherwise.  The loco doesn't need to be
> be running to supply cooling air when it is in motion, the heat is
> generated only when powering or dynamic braking.  A traction motor when
not
> being used is only two gears in mesh, and a car gear box doesn't need
> cooling air so why should a traction motor.

Why do heavy road trucks have their tail shafts disconnected from the
gear-box before towing sometimes?  Is this relevant?


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