(21 Jan 2014, 8:42 am)CatsFast101 wrote It was clear from the post I meant A/C lettering together. If you want to funny about you could argue 35A/35C however these don't represent the initial reason behind why use 2A/2C. As pointed out above it was supposed to be for anti clockwise and clockwise loop however silver arrows don't do a loop anymore and GNE have bother other services lettered like this expect the Laser Services which use the 'C' as way of identify the evening route to South Hetton. 36A/36C used to be part of this, however even these the 36 service don't use this lettering any more.
I wasn't been funny I have just misunderstood your post