
Indeed so, but you explained much more.Interesting question. Because the Glyn Valley ran for most of its length on the verge of a road it was designated as a tramway. The laws at the time insisted that steam powered tram locos had to have their motion covered to ensure it didn't frighten horses. In addition, they had to have condensing apparatus to limit the amount of steam which escaped and they were equipped with a bell which could be rung as a steam whistle was considered a risk to horses. The locos were also required to run in reverse so the driver would have an uninterrupted view of the route ahead. As a consequence, there is some discussion as to whether the locos should be regarded as 0-4-2T or 2-4-0T.
My loco represents the later guise after the condensing apparatus had been removed. It was found to adversely affect the locos performance and horses were quite oblivious to the difference it made.
Rik