The Napier Deltic engine is a British opposed-piston valveless, supercharged uniflow scavenged, two-stroke diesel engine used in marine and locomotive applications, designed and produced by D. Napier
The Deltic-powered Hunt-class mine countermeasures vessel HMS Ledbury
Napier-Deltic–powered British Rail Class 55 D9017 The Durham Light Infantry starting its engines at London King's Cross in 1966
Napier Deltic engine at the National Railway Museum, York
The British Rail Class 23 were a class of ten Bo-Bo diesel-electric locomotives built by the English Electric Company in 1959. The power unit used was a Napier Deltic T9-29 9-cylinder engine of 1,100
"Baby Deltic" D5902 at King's Cross, July 1966.
D5900 in 1961 without yellow ends or headcode boxes.
D5907, as modified, at King's Cross in July 1966.
At Derby Litchurch Lane Works, 02 August 2025