But you won't see "4464" picking up any water from a trough!
You may, however, be in for a treat. Bittern currently has special dispensation (for one month only) to run up to 90mph. Recently (June 29th) she set a heritage steam speed record by clocking 92.5mph on Mallard’s racing stretch between Grantham and Newark. On the subject of timing, the only other published time apart from the 16:30 York departure is set down at Potters Bar at 20:10. I have not got my mileage figures close to hand, but from memory, York to Kings Cross is about 200m, and Potters Bar about 15 less than that. This means Bittern is timed to cover to 185 miles in 220 minutes, so averaging about 50mph. York to Newark must be about 80 miles, so this would indicate a time at Newark of around 18:10. A bit rough and ready, but the best I can do !
If you're in the vicinity all six surviving A4s will reconvene (after their current stint in the NRM, York, ends) in Grantham's "Up" yard on September 7-8th. This is part of the "Great Gathering" arranged to celebrate the 75th anniversary of “Mallard’s” record breaking run on July 3rd 1938. Also expected to be present is Deltic D9002 “Kings Own Yorkshire Light Infantry”.