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- Darth Vaders: British Rail Class 460 Juniper electric multiple units (EMUs), so called due to their sloping cab ends.
- Deltics: British Rail Class 55 diesel-electric locomotives (the "Deltics"), which use twin Napier Deltic power units.
- Doodlebug: Waggon und Maschinenbau railbuses E79960-64, introduced 1958.
- Dusty Bin: British Rail Class 321, from the game show 3-2-1, featuring the animated character "Dusty Bin".
- Dutch: The livery of British Rail Civil Engineers department rolling stock, due to the resemblance of Nederlandse Spoorwegen's corporate livery.
Dyson:British Rail Class 92 so called because of the sound their traction blowers make as they go past.
Read more about this topic: Glossary Of United Kingdom Railway Terms