(10 Nov 2015, 7:32 pm)GX03 SVC wrote As 7518 is a all-routes spare and is not branded for services X21/X22 it is a rare/odd working.
Is it though? I always reported 5337/8 on Diamonds but eventually, after a while (and numerous people complaining), I realised that as the vehicles are to the same specification as the normal allocation, it isn't rare or odd at all. 7518 is a dedicated Sapphire spare vehicle in Sapphire livery, the X21/X22 are a Sapphire route, therefore, i don't see how it is a rare/odd working at all.