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Number 3 was originally built for the Barnum and Bailey circus trains which toured the UK at the end of the 19th century. It was based on the current US practice of the day, scaled down to fit the British loading gauge:
The ADR bought three of the redundant coaches. The verdandas and windows were substantially modified before being used on the ADR's only passenger service from Machen to Pontypridd, via Penrhos.
This is number 1 which was almost the same as number 3 except it also had windows in the ends:
One particular question I have not been able to resolve is what colour did the ADR paint it? Slinn in 'Great Western Way' states that ADR railmotor number 1 "appears to have been painted a dark brown". The peeling paint on the coach at Nantgarw clearly reveals that at least one coat of paint was brown but the question is which shade?
The vertical planked areas in this photo would not have been painted brown by the GWR. Coincidentally, the Pullman coach at York which was built in a similar style, with similar bogies and underframe, is also painted a similar shade of brown. However, this appears to be a much redder shade than the shade I recall as official Pullman Brown. John Lewis is of the opinion that this coach is in its original livery, SECR lake. So I will be taking a brown colour card next time I visit York!