From Festipedia, hosted by the FR Heritage Group

W. G. Bagnall & Co Ltd was a locomotive manufacturer in Stafford, trading between 1875 and 1962 in mainly small industrial steam and later also diesel locos. They were known for technical innovations like the Bagnall-Price and Baguley valve gears, marine-type circular fireboxes and inverted saddle tanks (side tanks connected under the smokebox). The firm had a good reputation for design and build quality and many of their engines were exported. A good number have been preserved including engines repatriated in recent years after use overseas. They also had their own brand of articulated locomotive[1], an example of which (Monarch) was briefly owned by the FR for possible use on the WHR, but in the end the necessary conversion work was considered too extensive and the loco returned to the Welshpool & Llanfair Light Railway.

Several other Bagnall locos have appeared as Visiting Locos and some are resident on the WHHR.