BrickLink - Part bb0012vb : LEGO Electric, Train Motor 12V with Wheels Type II with 3 Round Contact Holes [Electric, Train] - BrickLink Reference Catalog
LEGO 7865 12v Train Motor Set Parts Inventory and Instructions - LEGO Reference Guide
BrickLink - Set 7865-1 : LEGO 12V Motor [Train:Supplemental:12V] - BrickLink Reference Catalog
BrickLink - Set 7865-1 : LEGO 12V Motor [Train:Supplemental:12V] - BrickLink Reference Catalog