(12 Jan 2014, 12:20 pm)VolvoMarkII wrote Fast Cats is a pointless brand. Nothing 'fast' about it on the X35 end!
It's still marketed as an 'express service' however long it takes, hence 'Fast'. There are many express services - such as Arriva's X4/X5 as citaro5284 said above - which aren't particularly fast.
'Cats' no doubt links to the 'Black Cats' (hence colour of bus).
The brand is undoubtedly more suited to the X36 (it providing local Sunderland links as well as links further afield to Newcastle), but I wouldn't say it's 'pointless' for the X35 at all.