World's Greatest Locomotives... The Deltic

THE DELTIC: English Electric DP 1(1955) & Class 55 (1961)
Featuring Chris Barrie at the controls of a Class 55, this is the story of the landmark locomotive that used an extraordinary engine to revolutionise rail travel.
First developed for post-war speedboats, the amazing "opposed piston" Napier Deltic engine brilliantly overcame the fatal flaw of diesel engines at the time. They were efficient but had very poor power to weight ratio.
In triangular or "deltic formation" 3 pairs of pistons each share a cylinder, pushing against each other ... and so "opposed". Despite needing three crankshafts this system created much more power for much less weight
The Class 55 uses two 18 cylinder engines for a total power of 3,300 horsepower and speeds topping 100 miles an hour - making this a match for the most steam locomotives and much cheaper to run... steam was doomed.
WHAT MAKES IT GREAT… without doubt that brilliant rethinking of the piston engine
THE EXPERTS... Find out more at the Deltic Preservation Society thedps.co.uk/
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