43179 and 43028 had just passed the summit north of Logie with 1B88, the 16:04 Scotrail service from Aberdeen to Edinburgh, on 19 June 2023. From here it was downhill for a couple of miles to the Cowie Viaduct, just before Stonehaven, followed by a 7 mile climb to Drumlithie, the highest point on the line between Aberdeen and Dundee.