BrickLink - Book b76train1 : LEGO 12V Train Idea Leaflet (98560-l-ty/fr/ho.) [Idea Book:Train:12V] - BrickLink Reference Catalog
My dad collects 12V trains, these are some of the sealed ones he have bought over the years : r/lego
Classic LEGO sets: 12V Trains | Brickset: LEGO set guide and database
BrickLink - Part bb0012vb : LEGO Electric, Train Motor 12V with Wheels Type II with 3 Round Contact Holes [Electric, Train] - BrickLink Reference Catalog