Andrew, the reason for running a brake at each end of some lines like this - and that includes the Welshpool, is that there are no turning facilities for the locos or longer stock. Some lines have the short wagon turntables, like those we see in use for speeders in North America, but anything longer only travles facing the same direction - forever. The Welshpool has two composite brake coaches, you’ll recall, and if you look, you’ll not that the loco runs around the train. Same with the Tal-y-Llyn, too.
There are no turning Y’s on little railways here in UK - the lines were built as cheaply as possible, although that’s hard to imagine when you look at the glorious coaching stock inside and out…and land was always very dear - far too dear to use just to turn a loco around.
Now you have the whole set of three Pickering coaches? Same here.
tac, ig, ken the GFT & The Lynton Pet Shop Boys [I wonder if anybody here will understand the connection?]