This is an image from the Imperial War Museum Collection. ROYAL AIR FORCE BOMBER COMMAND, 1942-1945.© IWM (CH 17903)
Original photo link here - www.iwm.org.uk/collections/item/object/205210795
A tractor-drawn train of 4,000-lb Mark I HC bombs ('cookies') pauses on its journey from the bomb-dump at Mildenhall, Suffolk, while groundcrew chalk appropriate messages on them. In the background an Avro Lancaster Mark I, L7540 'OL-U', of No. 83 Squadron RAF's Lancaster Conversion Flight, normally based at Scampton, Lincolnshire, undergoes repairs: the unit code-letters of its previous operators, No. 44 Squadron RAF, are still visible under those of 83 Squadron.