All of my trips on the train I can recall of are as follows:

* Newcastle - Aberdeen
* Newcastle - Glasgow Central (via Edinburgh)
* Newcastle - Edinburgh Waverley
* Newcastle - Carlisle
* Newcastle - Corbridge
* Newcastle - Darlington
* Newcastle - Middlesbrough
* Newcastle - York (many, many times)
* Newcastle - Manchester Airport
* Newcastle - Derby (via Doncaster going there, via Sheffield coming back)
* Newcastle - London King's Cross
* MetroCentre - Corbridge
* Middlesbrough - Grosmont
* Darlington - Shildon
* Aberdeen - Edinburgh Waverley
* Manchester Airport - York
* Derby - Whatstandwell
* Carlisle - Preston

I think that's it. If there's any more, I'll add it to the list.