The extension is coming along very nicely, re: the 04 tram, everything I have suggests, (although doesn't implicitly state,) that the 04 were in black during their time on the line, but as one of my aims is to run the last ever train, which was 3 16T mineral wagons and a southern brakevan, ( I have a model of this made from the Cambrian kit,) getting the right colour for the time is very important to me. It looks like green may be the correct way to go after all.