Axles

Axles are of two types, powered and un-powered. Below is the standard U.S. axle, the "D" is the most used.

To make you can use just 24 segments as you can not see axles that good. The only thing you need is "K" and "I" and "A+B" for the baring.

Powered axles are not tapered and for most Diesels you can not see the axle at all due to the motors and gearbox.