I didn’t like the look of the original trucks; while they look OK under that model, they just don’t look like boxcab trucks.

First, I removed the side rods.  They serve no functional purpose and were not used on boxcabs since they had a traction motor on each axle.

I wanted a more open looking truck, so I cut away a lot of the plastic that was hiding the wheels. 

I built some journals out of styrene and added some other parts and some cast nuts for “detail”.

The final result looks considerably different from the original.