Re: 100-ton Andrews trucks in HO
Dave and Richard,
The familiar US Navy Helium tank cars rode on 100-ton trucks. The earliest versions were Andrews. There's a decent photo in the FSA/OWI collection at loc.gov.
I'd like to cook up a set in 3D to accurately model the helium cars. In a pinch though, others have adapted the old MDC heavy duty truck with outside hung brake beams by sawing off the roller bearings and transplanting plain bearing journal boxes. Apparently the trickiest part is gluing the slippery deleon plastic.