Following a survey of the Grade B-listed structure to identify areas of metal in need of repair, investigations revealed bomb and bullet damage on span three of the bridge, thought to have been caused by a bombing raid by the Luftwaffe during World War 2 in August 1941.
Some of the holes had previously been patched over, while others of less of a concern will be addressed as part of Network Rail's project.
Matthew Spence, route delivery director for Network Rail said: "We take seriously our responsibility to maintain and preserve these historic structures, not just for the safe and efficient operation of the railway, but also how they look in their setting for those travelling on the railway or visitors to the area enjoying the beautiful views.
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"Uncovering the historic damage to South Esk viaduct has offered an unexpected though fascinating glimpse into the harsh reality of life during the war. These structures are solid and built to last and so the power unleashed by the bombs and bullets to mark and pierce the metal in the way that they have must have been ferocious.
"Seeing the bullet holes close up gives those working on the bridge today a reminder of the contribution made by everyone on the railway to the war effort – often in challenging, tragic and dangerous circumstances.
"While the emphasis then was to patch up the damage and get the railway moving again as quickly as possible, we now take it as our duty to pick up the repairs started by those railway engineers in August 1941 and properly complete the job they started."
(LM)
