LEGO bb53 How to fix 12V grinder for railway motor type 1 - Flagsoft
LEGO part bb12v - Red Electric, Train Motor 12V Modern at BrickScout
LEGO Set 703-1 12V Replacement Electric Motor (1969 Train > 12V) | Rebrickable - Build with LEGO
LEGO® Motor History
LEGO 9V Technic Motors compared characteristics
12 Volt LEGO Train | Holger Matthes
LEGO® Motor History
BrickLink - Part bb0012vb : LEGO Electric, Train Motor 12V with Wheels Type II with 3 Round Contact Holes [Electric, Train] - BrickLink Reference Catalog
Trains | Supplemental / 12V | Brickset: LEGO set guide and database
Help: when were your 12v motors released? Let's complete the table! - LEGO Train Tech - Eurobricks Forums