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Some of these were cancelled due to lack of bookings (I was booked on one from York to Scarborough advertised with 20's which got cancelled), so presumably they don't believe there is enough demand to warrant running them.
Their current focus is on expanding their dining offering and bringing it all in-house. As with other operators, I think they have realised dining is where the big money is. Plus they are now starting to get more revenue by hiring out their fleet to other promoters and even operating their trains, as with the recent batch of Tornado tours announced by the A1 Trust.