| Builder | Products | Notes | |
|---|---|---|---|
| KTH | Kitson Thompson Hewitson | Rail Road | This was the name under which the Airedale Foundry operated for around 20 years before the name Kitson & Co was adopted. The two oldest working steam locomotives in the world, India's Express and Fairy Queen were produced in this period
|
Books
Note - there might be a few builders in this list that are not in Leeds as they built Leeds designed locos as sub contractors.