The Sodor Ironworks, also known as the Sodor Steelworks or the Smelter's Yard, is a special company that serves the Island of Sodor. 'Arry and Bert are the only two engines that work here. The site was first introduced in the fifth season.
The Sodor Ironworks is a large foundry where scrap metal is delivered, gets melted down to become molten and is then used for constructing other things, especially for making furniture and buildings. The site consists of a large smelting shed, a lot of sidings and a turntable, as well as a heap of twisted scrap metal and scrapped engines. The steam engines find the Sodor Ironworks very scary and frightening, especially in the dark, when fizzling sparks fall from huge ladles full of molten metal and when spooky shadows move around.
In the 2000 film, Thomas and the Magic Railroad, Diesel 10 explained to his two sidekicks, Splatter and Dodge, about his plans to get rid of Lady, Mr. Conductor and The Magic Railroad. Toby overheard them and after ringing his bell to make his presence known, Diesel 10 accidentally knocked over one of the shed's supports, causing it to suddenly fall, trapping the three diesels for the night. Later, James was working at the Sodor Ironworks, but was then cornered by Diesel 10. Junior, who had been on Diesel 10's cab roof, was flung onto James' roof when Diesel 10 suddenly stopped in front of him. James began reversing, but accidentally crushed a small set of wooden buffers that stopped the engines from crashing into the melting pit behind them. Junior used the Conductor family's last supply of gold dust to escape and luckily, he and James were safely teleported away from Diesel 10, who was shocked to see them just disappear.