Train Battery Box Car with Red Switch and Black Wheels with 'DB 7722' and Weight Table Pattern on Both Sides (Stickers) - Set 7722 (Undetermined Type) : Part x488c02pb01 | BrickLink
Steam Cargo Train, battery : Set 7722-1 | BrickLink
LEGO 7722 Steam Cargo Train, Battery Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO 7722 Steam Cargo Train Set | BrickEconomy
LEGO 7722: Steam Cargo Train Set | Brickset: LEGO set guide and database
Vintage LEGO 4.5V Train 7722 Battery Train Set from 1985 Steam Cargo - YouTube