- Rocking Arms
- or rocking levers, these are normally associated with four-cylinder engines where the motion from one set of valves is used to operate a second set by means of levers, rather than a complete additional set of valve gear
 . One example is the ‘Jubilee’ class compounds where the inside valve gear was connected to valves for the outside cylinders via levers mounted ahead of the cylinders. In the ‘Claughton’ class locomotives the outside valve gear operated valves for the inside cylinders in a similar manner.
- Roundhouse
- A railway locomotive shed covering tracks which are grouped radially from a turntable. In British practice the actual building was more usually square or rectangular. Roundhouse sheds were not often found on the LNWR, which preferred straight road sheds (exceptions include Camden, Curzon Street and Longsight). Some other lines, including the Midland Railway and Great Western Railway, used roundhouses extensively. The advantage of the arrangement was that each locomotive could enter or leave the shed without having to move others. The weakness was if the central turntable broke down, then the whole shed was disabled.
- Royal Train
- ??
- RTK coach
- British Railways’ nomenclature for Restaurant Third class Korridor (sic) coach, with kitchen, pantry and seating accommodation for diners. [K used to differentiate Corridor from Composite].
- Runcorn Bridge
- The high level bridge over the River Mersey brought into use in 1881; it was the essential link in the cut off which shortened the route between Liverpool and Crewe.
- Running Gear
- The mechanical parts of a carriage or wagon underframe which enable it to function. i.e. wheels, bearings, springs, buffers, couplings and the like.
- Running Lines
- Tracks for through train movements as distinct from sidings, bays, docks and yards
- Running Number
- The number actually carried by a locomotive, carriage or wagon, used to identify it for traffic purposes. Analogous to theregistration number of a car. Other numbers might be recorded for internal or engineering purposes, such as sequential building numbers, motion numbers, boiler numbers, account numbers and so forth.
- Running Plate
- A foot ledge running the length of a locomotive at the approximate height of the foot-plate.
- Running Powers
- A formal arrangement by which one or more 'foreign' companies could exercise a right to operate trains over the owning company’s lines in return for a rental payment.
- Running Rails
- Rails upon which wheels roll, as distinct from check rails which are for guiding only, or conductor rails which are used for electrical pick- up only.
- Running Signal
- A collective term for a signal that governs movement on a running line, but not a shunting signal.
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