Re: Dead hauling diesels

["Patrick J Buchanan" <mainline@cyber.net.au>]

Aus loco discussion mailing list

Speaking from a NSW perspective !!
DE have been hauled 'Dead Attached' for as long as I can remember.
Indeed, I have at least 2 different Movie/Video sequences of 49's D/A behind
a single 60 and a TF and 60 on #N645 on their way to Cardiff for a G/O.
However, in the case of the 73 'Diesel Hydraulics', it always seemed to be
necessary to have their tail shafts 'disconnected' or 'removed' when D/A.
Usually when a transfer from depot to depot of the 73's occurred,
they ran L/E.
QR seemed to have a less formal approach. And the DH's rostered for any of
the many 'lightly laid' branch lines were simply D/A 'somewhere' in one of
the appropriate mainline 'shunt trains'.
Indeed, not that long ago, QR classified engines D/A, simply as a wagon that
was part of the train.
It was quite common to see a DE or 2 a couple of wagons behind the train
engine !!
Regards
Patrick J. Buchanan
mainline@cyber.net.au
The MAINLINERS Gallery :-
http://www.sydney.cyber.net.au/~mainline/index.html
-----Original Message-----
From: Stephen Molloy <c501@diesel.net.au>
To: Aus loco discussion mailing list <Ausloco@listbot.com>
Date: Saturday, 15 April 2000 10:52
Subject: Re: Dead hauling diesels


>Aus loco discussion mailing list
>
>>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.  On General Motors locos when
>using dynaimc brake the engine revs increase to the equivelant of notch 4
>when the handle is moved out of the "Set Up" position, the increase in
>engine revs is to increase cooling air to the motors,  but this isn't even
>needed initially.  On MK rebuilds ie. ALF, CLF, CLP, and also NR's,the
>dynamic brake lever can be advanced to full Dynamic without an increase in
>engine revs for cooling, a temp sensor within the traction motor tells the
>engine when it should increase the revs at a pre determined temp.  So why
>would it neeed cooling when not even doing anything ??
>
>Stephen Molloy


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