The #21860 kit includes all the etched and machined brass parts required to build the locomotive shell, a drilling fixture, drill bits and a tap to modify the Marklin 88051 chassis (chassis not included), brass fasteners, front and rear blackened bronze flangeless wheel sets, constant front lighting circuit, LED rear lights, MTL couplers and detailed step by step instructions. The locomotive's hood and roof has been factory pre-formed, the holes on the coupler brackets are pre-threaded and the holes for the grab irons are pre-sized. All other holes need to be re-sized prior assembly. Click here to download the Assembly Instructions