The second UPC was used to a greater extent as a general-purpose vehicle which quickly set the pace for further development and little more than two years later, a 24-seater version based on two of the original units with one cab removed and an 18-seat gondola between them, was delivered to Thoresby Colliery. This unit train as it was called, operated well, but again the NCB came up with a number of minor changes and additions which they would like to have made on any future models, which would have had a longer gondola to seat 24. Unfortunately the Miners Strike early in 1984 interrupted plans for further development of this vehicle and no more progress was made.