There have also been occasions where Museums or clubs owning Steam Locos bid for contracts hauling freight and provide the service using their Steamers. Example here where they supply a railway construction site [1] or here [2] were some fertiliser is pulled.

[1] - https://www.youtube.com/watch?v=8GujoYkaQf8 [2] - https://www.youtube.com/watch?v=1qoDOXvFwH0