A puzzle for #AlllMetalMonday spotted lurking a field as we walked from the train to #Prestongrange #EastLothian Any ideas please?

Section of the Clyde Railway Viaduct for #AlllMetalMonday originally constructed 1849 with a second span added 1878 to meet the increased volume of traffic and a footway in 1910 to allow the men access to Blantyreferme Colliery Pits 1 & 2
#RailwayHeritage #MiningHeritage