LEGO 7720 4.5v Battery Operated Diesel Freight Train From 1980 - USED Plus Extra | eBay
Train Battery Box Car with Switch and Red Wheels and Cargo Doors Pattern on Both Sides (Stickers) - Set 7720 (Undetermined Type) : Part x488c01pb03 | BrickLink
LEGO 7720 Diesel Freight Train Set, Battery Set Parts Inventory and Instructions - LEGO Reference Guide
Diesel Freight Train Set, battery : Set 7720-1 | BrickLink
7735 Freight Train Set | Brickipedia | Fandom
Vintage Battery Train Lot Lego (7720) Track - Some Space And More 80s Parts | eBay