Reply to "What Have You 3-Rail Scaled Lately?? Please Contribute to this Thread!!"

L & NOGR Forum Member

Engineer-Joe posted:
Could you share how you did this? I run 2 rail and skipped this engine because it didn't look easy to convert.

It wasn't easy. I originally had the stock MTH drive axles machined to accept NWSL 33" wheels. When I pressed the wheels on to the MTH axles, the insulator in the middle of the axle collapsed. I ordered 3/16" axle stock from NWSL and had the machinist make completely new axles. The idler outboard axles and bearings were removed, The bearings were replaced with NWSL 361-6 epoxied in place, and 8277-4 wheelsets. Approximately .220" was machined off of each sideframe mounting flange, .120" was milled off of each sideframe, new holes were drilled and tapped to mount the sideframe on the truck block.

The pilots were a little easier, MTH provided a threaded blind hole in each corner (2.6mm). I just cut the center section out, drilled a hole and mounted them without a spacer as that made the steps line up per the prototype.

Steve

4/2/1710:35 PM

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