I bought the rack loco No 19 from UK Coal back in 2004 to ensure that one was saved for preservation. I kept it at Foxfield Colliery and subsequently passed the loco onto Statfold for final preservation in their Hunslet collection. I think that it was the last loco brought up from a UK coal mine for preservation, but I would be delighted to be contradicted.
Despite it's woebegone state, it was actually a runner and was driven to the shaft bottom, brought up to the top and driven into the workshop at the Mine.
There was a sizable fleet of rack locos built for British Coal by Hunslet of various sizes and there are other examples preserved at Caphouse and the Middleton Railway in Leeds.
The best reference for the Hunslet locos is Don Townsley's The Hunslet Engine Works, a wonderful book detailing the history of this iconic loco manufacturer.
I have posted some photos of the loco collection from Stillingfleet mine here:
http://www.aditnow.co.uk/album/Stillingfleet-Colliery-Coal-Colliery-User-Album/ Cheers
Alan