FR Wiki says:-
"An 0-6-0DH, this locomotive was built at Boston Lodge using parts bought from Baguley-Drewry following that company's liquidation, although much was built new. Experience with Harlech Castle had suggested that a similar locomotive would have potential as a passenger locomotive and the "in house" designed bodywork reflect the links between the two locos. Entering service in 1995, the loco sees regular service in the passenger fleet, and is fitted with advanced computer controls which enables the use of the Push Pull system. This allows the engine to remain at the top end of the train on "down" services, being driven from a cab in observation Carriage 111."
Doesn't mention the engine type though. I think that article is incorrect. There were 3 identical locos constructed (or partly constructed) by Baguley-Drewry. One was complete, and is on the Bredgar line, one is Criccieth Castle, and the third is on VoR. I believe that the Bredgar line bought all three from Baguley, kept the one that had been completed, and sold the other two (partially built) ones on.