Sodor and Mainland Railway Numbers 1 and 3

According to The Island of Sodor: Its People, History and Railways, there are four 0-4-0T engines with open and square tanks that operated on the Sodor & Mainland Railway from 1883 until the line went bankrupt. Little is known of these locomotives. Of these, only the first, third and fourth have ever mentioned in a story (in Very Old Engines), and are named Shaun, Jacob and Harry. Neil is one last engine from Very Old Engines. He's a Neilson 0-4-0 box tank.