Glossary of United Kingdom Railway Terms - R

R

• Rat: British Rail Class 25 diesel-electric locomotives – and related classes – reputedly originating from a term used on the LMR of British Rail in the 1960s where 25s were as common as "rats"; the Scottish-based Class 26 and 27 were sometimes known as "MacRats".

• Roarer: Early British Rail 25 kV AC electric locomotive of types 'AL1'–'AL5' (later Classes 81, 82, 83, 84, 85), due to the loud whine made by the traction motor cooling fans when the locomotive is at rest. The name originated with the AL3 type. Although the other types exhibit a less noticeable noise, the name is applied equally to any of them.