In the past Dunbar had very few services to going to Newcastle, (maybe 3 per day under GNER) so it was permitted to do Dunbar - Edinburgh - Newcastle as an example. Now XC have increased the number of calls has that easment gone?
It's still there. However, there is also an restriction stating that passengers with tickets marked "DIRECT" can not go via Edinburgh.
Here are the relevant easements as far as I can see.
700161 - Customers travelling from Dunbar to Newcastle and beyond in possession of tickets routed 'DIRECT' may not travel via Edinburgh. This easement applies in both directions.
700166 - Customers travelling from Dunbar to Acklington, Widdrington, Pegswood,Morpeth, Cramlington and Manors in possession of tickets routed 'Any Permitted' may travel via Edinburgh. This easement applies in both directions.
700167 - Customers travelling from Dunbar to Morpeth in possession of tickets routed 'Any Permitted' may travel via Edinburgh. This easement applies in both directions.
700478 - Customers travelling via Berwick Upon Tweed to stations Musselburgh, Wallyford, Prestonpans, Longniddry, Drem, North Berwick and Dunbar in possession of tickets routed "Any Permitted" or "EC & Connections" may double back via Edinburgh. This easement applies in both directions.
However, a quick search does show that you can get tickets between Dunbar and Newcastle via Edinburgh for the price of £51.70 (Off Peak Return) - i.e. the same price as an Edinburgh to Newcastle OPR. But the DIRECT ticket comes in at £34.40 for the Off Peak Return. So there is in effect a significant increase in the price if you go via Edinburgh.
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I think that's the wrong way round: Edinburgh Park is a member of Edinburgh Group, and doubling back within a routeing group is not allowed at the origin or destination of a journey, only for interchange during a journey.
ATOC disagrees. Edinburgh Park is not listed as a member of Edinburgh Group.
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Of course Glasgow and Falkirk High have fast services to Haymarket and Croy you have little choice outside the peak but to double back. (in the morning the 0800 ex Glasgow has a very good connection at Polmont). I guess as Bishopbriggs, Lenzie and Croy have little choice by to double back that is why it is allowed.
If you're talking about Glasgow passengers, the North Clyde route is probably the easiest way to get to Park station. There's rarely any significant journey time advantage to be had by changing.