The Sodor Ironworks, also known as the Smelter's Yard, is a company serving Sodor in the television series, first introduced in the fifth season. It appeared frequently until the twelfth season, but has been mentioned frequently since then. The Ironworks is a huge foundry where scrap iron is delivered to be melted down to become molten iron. The site consists of a smelting shed, a lot of sidings and a turntable as well as heaps of twisted scrap metal and steam engines for scrap. The steam engines find the Ironworks very scary, especially in the dark, when fizzling sparks fall from huge ladles full of molten iron, and shadows move around. 'Arry and Bert were first based here.

In Thomas and the Magic Railroad, Diesel 10 explained to Splatter and Dodge 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 the shed the three diesels were under, trapping them. Later, James was working at the Smelter's when Diesel 10 cornered him. Junior, who had been on Diesel 10's cab roof, was flung onto James' roof when Diesel 10 suddenly stopped. James began reversing, but crushed a set of buffers that were stopping trains from crashing into the melting pit behind them. Junior used the Conductor family's last supply of gold dust to escape.

In Calling All Engines!Henry and Percy had to sleep here due to Tidmouth Sheds being rebuilt.

The Ironworks are located on the Killdane Branch Line south of Killdane.