Glossary of United Kingdom Railway Terms - P

P

• Peak: British Rail Class 44, Class 45 or Class 46 diesel-electric locomotives – so named because the earliest of these loco types, the ten Class 44s, were named after mountains.

• Plastics/Pigs: British Rail Class 442, "Wessex Electrics" (electric multiple units): so-named for being mostly made out of plastics in construction.