;Prairie:Locomotive with a 2-6-2 wheel configuration
;PTR:Port Talbot Railway & Docks Company
;R&H:
;Ruston:Ruston and Hornsby Ltd. of Lincoln, engineer and locomotive manufacturer acquired by English Electric in 1966
;Raven:Sir Vincent Litchfield Raven, Chief Mechanical Engineer (CME) of the North Eastern Railway 1910-1922
;Rexine:an early form of vinyl used by the LNER for wall coverings in teak coaches