In looking through the parts diagrams it appears that most 4 axle Bachmann diesels use a similar truck assembly, with different sideframes as appropriate. since these would be interchangeable, why not use the appropriate sideframes for a particular locomotive. an example would be the b23-7, which comes with the floating boltster style of sideframes. b24-7s built for family lines/csx used trucks from emd trade ins, so a simple swap of a blomberg sideframe would make a more accurate model. the same with the conrail b23-7, which used the type b sideframe used under the rs3 and fa2. other examples would be gp30s and gp35s built for a variety of lines using trucks from traded in alco fa's.
at the very least, please make the sideframes only available from parts & service. it doesn't make sense to have to buy the entire truck assembly when all you want are the sideframes.
Jeff
I agree with you. I have swapped side frames out quite a few times.
Jerry