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 the "Coffee Pots", and the four Wellsworth and Suddery Railway Tank Engines, the Railway had no other engines of its own. Therefore, engines were leased from the Midland and Furness railways on the Mainland until more could be purchased, and they were relied upon heavily during the First World War. Edward was one of the engines to arrive because of this arrangement.
By 1923, most of these engines had returned to their original railways and replacements had been found. No precise details of the engines were given, thus little is known about them.