To fit a Margate (British) made tender drive loco, originally from aR 355 model.
Hornby OO MR Compound 4-4-0 Non-motorised Rolling Chassis Margate - Please Read
Hornby OO Gauge MR/LMS Compound 4P Maroon Motorised Tender Drive Unit - British
R30377 Hornby OO Gauge RailRoad MR Class 4P Compound Train Pack - Era 3