Four small engines run on their own special line, looked after by the Thin Controller.
- ISBN10 043492766X
- ISBN13 9780434927661
- Publish Date 31 July 1987 (first published December 1954)
- Publish Status Out of Print
- Out of Print 3 December 2011
- Publish Country GB
- Publisher Egmont UK Ltd
- Imprint Heinemann Young Books
- Format Paperback
- Language English