His name was Charlie and he operated the Anderton Boat Lift. He was brought up on a barge on the canal where his father operated the lift before him. He had pneumonia three times because of the damp, he said. The lift provides a 50 feet vertical link between two navigable waterways: the River Weaver and the Trent and Mersey Canal in north-west England.
The picture was taken on the best colour film Kodak ever made: Kodachrome II, the sharpest, the most natural saturated colours under any lighting conditions, and you could expose it for half an hour and it wouldn't change colour. This is a recent scan from the original.