The North Western Railway faced a locomotive shortage in its early days, according to The Island of Sodor: Its People, History and Railways.
Aside from Thomas, Edward, the "Coffee Pots", and the Wellsworth and Suddery Railway Tank Engines, it had no other engines of its own. Therefore, engines were leased from the Midland Railway on the mainland until more could be purchased, and they were relied upon heavily during WWI. This arrangement had ended by 1923, when the events of The Three Railway Engines took place. No precise details of the engines were given, thus little is known about them.
|Other Sudrian railways|
|Bill and Ben • Neil • Sodor and Mainland Railway Numbers 1 and 3 • "Coffee Pots" • Wellsworth and Suddery Railway Tank Engines • Midland Railway Engines • The Little Blue Tank Engine • Mavis • Skarloey Funicular Railway • Ministry of Defence Engine|
|Stephen • Timothy • Millie|
|Victor • Sidney • Little Barford • Silver • The Old Tram Car • The Pier Train • The Cable Car • The Dark Green Tank Engine • The Little Blue Engine|