Ok not sure if it would be the first but i've certainly never seen one before. Saying that I didn't actually see this one as the path had dropped just below where the line was visible but the deep rumble accompanied by a high pitch whining suggests it was a class 70.
If anyone more knowledgeable could shed any light i'd be grateful. Especially whether it was a one off or likely to be repeated. It passed through St Neots station at 20:35 today (17/08)
If anyone more knowledgeable could shed any light i'd be grateful. Especially whether it was a one off or likely to be repeated. It passed through St Neots station at 20:35 today (17/08)