Re: 40 class bogies
David Bromage (dbromage@metz.une.edu.au)
8 Oct 1997 04:49:53 GMT
Allan Brown (ajbrown@ozemail.com.au) wrote:
>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.
>
>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!!!).
Cost? Don't forget they were trying to take an off the shelf unit and get
it into service for Australian conditions pretty quickly. The RDS4/5 only
had 4 powered axles, so......
Cheers
David