Re: 40 class bogies

Allan Brown (ajbrown@ozemail.com.au)
Wed, 08 Oct 1997 14:29:26 +1000

David Bromage wrote:
>
> Allan Brown (ajbrown@ozemail.com.au) wrote:
> >It is written that the NSWGR 40 class diesel electrics were a derivative
> >of the American RSD4/5 units, but suitably altered for local conditions.
> >Considering that the RSD4/5s had asymmetric bogies with all axles
> >driving, what prompted the change resulting in the 40 class having
> >equdistant A-1-A bogies? Why wasn't a Bo-Bo arrangement used?
>
> The same reason the GM1 was A1A and the original F7 was Bo-Bo, to reduce
> the axle load. The class 40 weighs 113t for a maximum axle load of 19t.
> On Bo-Bo bogies this would mean an axle load of 28.25t.
>
> Cheers
> David

Thanks, David. If the dummy centre axle is there to help disperse the
weight, why not put it to work by powering it? I must be thick, or
something! (Terry - stay out of this!!!).

Allan