Before Oct '86:

X11: Newcastle - Consett via Rowlands Gill (Later altered to operate via Burnopfield and Dipton)
X16/17 Newcastle - Redcar (Irregular services - one went via Beamish and Durham, whilst the other went via Billingham)
X20: Newcastle - Bishop Auckland via Durham (This may have went to Crook at some point prior or after instead of Bishop Auckland)
X27: Newcastle - Hutton Henry via Shotton and Wingate (OK Travel)
X40: Newcastle - Blackhall Mill via Gateshead, Rowlands Gill and Chopwell
X41: Newcastle - Clara Vale via Gateshead, Blaydon and Ryton
X42: Newcastle - High Spen via Gateshead, Blaydon, and Crawcrook
X51/52: Newcastle - Whickham *Fellside Park) via A1 and Dunston Bank
X55: Newcastle - Hartlepool via Peterlee (Direct to Peterlee)
X64: Newcastle - Low Prudhoe
X86: Washington - Sunderland (Became the 186 - more or less - without the limited stop section between Concord and Sunderland)
X97/98: Gateshead - Whickham Circular (Later extended to Newcastle Worswick Street - current 301 route but excluding Fellside Park)