No 46231 Duchess of Atholl climbs Beattock near Harthope with down express 1S51 in c1963. 1S51 was the SO 9.15am Crewe-Glasgow and did not run in the winter timetable. The headcode format changed between '60 and '61 from W241 to 1S51


Photo: W.J. Verden Anderson/Rail Archive Stephenson