BrickLink - Part bb0012vb : LEGO Electric, Train Motor 12V with Wheels Type II with 3 Round Contact Holes [Electric, Train] - BrickLink Reference Catalog
Lego 12V Train Motor (x550a) Wheel Anti-slip Rubbers by András Bognár | Download free STL model | Printables.com
Classic LEGO sets: 12V Trains | Brickset: LEGO set guide and database
Some Custom Lego 12V Trains: A Quick Overview - YouTube
LEGO 720-2 Train with 12 Volt Electric Motor Set Parts Inventory and Instructions - LEGO Reference Guide
The 12v Lego train layout | Matthew Lawrence | Flickr
12 Volt LEGO Train | Holger Matthes
12 Volt LEGO Train | Holger Matthes
LEGO MOC never released 12V Crocodile by Klemmie | Rebrickable - Build with LEGO