Alco switcher with roller bearings?

[osrr]

Does anyone make an Alco switcher with roller bearings? Or is there a way to put roller bearing trucks on any of the currently produced switchers?

[iomalley]

Miniatures by Eric makes roller bearing caps that you can swap on your trucks.

miniaturesbyeric.com/itm00040.htm

Trainstation products makes sideframes with RBs. They fit either athearn or proto trucks.

If you check with Kaslo, you might be able to get some bearing caps from their S13u kit. They look similar but are boxed (like they cut the oil box off)