There is a short article about Ernest Sykes, V.C., in the Journal of the London & North Western Railway Society - Vol 1, No 8, September 1995, pp239-240. This is because L&NWR locomotive No 2035, built in March 1920, was given the name "Private E. Sykes V.C." in February 1922, he having been an L&NWR employee. The article carries a photograph of Ernest Sykes receiving his medal from King George V on 21st July 1917, and one showing the engine 2035 in Stalybridge station with Sykes - then a railway guard - on the footplate alongside the engine driver and fireman. (This was an earlier engine than the one in the photo, No 5537, posted by Geoff-E, which was built in 1933 and took the same name.)
Some biographical details are given in the article, but unfortunately the date of his heroic actions is given as 19th April.