One of two trains booked to overtake the Royal Scotsman is 1S11 1000 Kings Cross to Aberdeen HST working. 43311 is the lead powercar passing by 37685 and 37516.
The East Coast operated service speeds on with Leuchars as its next stop. The line is carried on a high embankment climbing at 1 in 160 stiffening to 1 in 129 just by here.
On the back of the train from London is 43307.
