Columbia 2 speed rear end, IFM -46. I pulled it apart, cleaned it up, visually inspected and replaced the pinion bearings, it is in really good condition mechanically. It comes with the vacuum canister which will need new leather seals and also what I believe to be 39 juice brakes with the big 5 bolt pattern. Ed (219) 808-1105 Ehaynes@progressrail.com