You're assuming it would be from Leeds, but it could be from York if the rest of the line between Knaresborough and Cattal and Kirk Hammerton to Poppleton was doubled!
I explicitly mentioned a York routing, but unless you build the third side of the triangle (which will ruin the business case as it's 2 junctions nobody will want to use on a regular basis) you have to reverse at Harrogate.
TOCs and FOCs aren't going to use it on a regular basis as it's a massive time penalty however you do it, and freight operators have plenty of room on the Slows of the Racing stretch. If it's during a planned block then LNER might run 1tph just to keep something in the timetable, but TPE will just cut short at York. Freight will either just not run or divert via Carlisle, as all the diversionary capacity will be snaffled by the addtiional LNER. The only time it would be used by FOCs or other TOCs would be in an emergency such as dewirement at Thirsk to clear the line, but I bet it will be no more than trains already departed and with crew who need to be the far side of the obstruction. All others will be cancelled.
They're always one and its certainly not true in the slightest!
I know some people are like that but I'm certainly more crayonista for new lines!
I didn't necessarily mean only your goal, but more the goal of the project generally.
Just a pragmatist really!
A pragmatist would not be suggesting going any further than Ripon. Extending a single line as far as Ripon, and building a station in a location accessible to the town without a car would be a reasonable project in the context of decarbonisation, etc. Give a clean, quick journey to Leeds with 1 change to York - very reasonable service for a relatively small town. Bus links would be a pragmatic response to connecting Ripon to Thirsk & Nothallerton. Far from ideal, but given the additional cost a reasonable spend of taxpayers money.
To go further North involves either demolition or a parkway-type station, and a much more complicated interaction with the ECML at either Thirsk or Northallerton. Not to mention trying to come up with services that can be operated without a total recast of the timetable and stuffing the new HS2 Edinburgh/Newcastle paths when they come along. All of these add a ridiculous amount of cost in comparison to the fairly simple extending existing services.