 There were sub-depôts at other South Wales towns and as the Western Welsh took over some other ’bus companies, the depôt symbols were extended with variations in diamond filled in colour plus letters like AM for Ammanford and E for Ely works and colours grey and white were introduced and some diamonds bore two colours, split horizontally.The absorption of the former Neath & Cardiff (N&C) express ’bus company meant that a white triangle was added to the coach side.A separate colour chart of principal symbols seen on a wallchart in 1949 is viewable in jpg format on Wikipedia.