I need help finding out if Athearns RTR/BB 4 axle trucks are all the same except for the sideframes that are used? I am working on a custom project that will be using 4 axle trucks and I have a few athearn BB and RTR 4 axle trucks that I can use off a P40/42. I want to make sure these trucks are the same as GP40-2 and vice versa. Will I be able to just plop Blomberg B truck sideframes on the P40 truck assemblies?
The best indication is if they (the P42 trucks, or at least the basic truck housings) have the same part number as Athearn's standard Blomberg truck found under GP38-2's, GP9's, F7's, etc. The HO Seeker site has some Athearn exploded diagram literature that may help.
But chances are the P42 truck wheel spacing is be different than the EMD Blomberg spacing.
hmm, i checked out that site and every gp has different part #'s for the 4 axle's. Does athearn seriosly make all those different 4 axle trucks? I figured they would make 1 or 2 different ones and then just change sideframes to make it cheaper for them to produce and make more money.
I have a P42 and its the same trucks as my other Athearn BB/RTR units, just different sideframes. Earl...
Looks like I might sacrifice a P42 for its trucks. hahahaha My kitbashed prototype model is coming to life slowly. Got a friend going to help with some milling of the frame to allow for parts ot fit and make new bolsters for the 4 axle trucks.
The Athearn bb trucks are all the same. There is different wheel bases, switcher, road unit, and 6 axle. I dont know about the newer kits, but all mine run on the old bb ones, the wheels, axles, gears, are mostly interchangable. the sideframes clip of, and swap them out. Even the GE unit trucks are the same as the EMD, just the sideframes change. Also the Athearn frames all mount the trucks the same way, and its easy to chop a fram, and correct it to whatever wheelbase you want. Any questions about the BB ones, just pm me .
Just another quick note. The older BB unit part numbers were changed over the years, as new ones were developed. But when you get down to it, the parts are for the most part are interchangable. I have exploded diagrams that go back to the 70's, and up to when Athearn switched to the new line.