As Andreos1 said, competition may be something which has impacted the decision, having double deckers and/or high spec buses with wifi etc. can all attack passengers.
35 has competition from Stagecoach E1/E2/E6 to South Shields, there's also completion with the 13 on the 35A to silksworth and also stagecoach services up to the hospital. Not competition around Houghton like.
However the 20 has little competition, maybe Durham road you could say it's up against the 4 but GNE have a few services that way anyways. And then nothing from Board inn till Gilesgate when the 64 then 22/24 into Durham.
CatsFast101
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RE: 2014 GNE Bus Order Predictions