Available SOON! Awaiting revised gears! Check back soon!

The BB-48 is a 48:1 ball bearing drive gearbox with an input shaft 1.07" center line height from the drive axle. Drive axle diameters are 3mm, 1/8" and 4mm etc and are made to order. Ideal for small On3/On30 locos, large Sn3 locos, and small standard gauge S locos. The gearbox features a top mounted, centered mounting boss enabling installation in On3 Mason Bogie 2-6-6s where the boiler weight needs to be centered over the #2 axle. The gearbox comes unassembled and requires some drilling out of marker holes and tapping with a 00-90 tap.