- Side Corridor
- Gangways were normally central in the end of the vehicle though some early LNWR parcel vans and TPOs had gangways offset from the centre, when perversely, they were then called “side-corridor”.
- Side Gangway
- Flexible connection between vehicles to enable train crew and passengers to pass from one carriage or NPCS
 to the next whilst the train is in motion. Gangways were normally central in the end of the vehicle though TPOs and certain vehicles intended to run with them had Lansdowne pattern side gangways which increased the available working or stowage space.
- Side Tank
- A steam locomotive which carries its water supply in tanks mounted on the running plates on either side of the boiler.
- Side Tank Coal Locomotive Class
- The official designation of Webb’s ”Coal Tank”.
- Siding
- A length of railway track used for storing rolling stock between journeys or while waiting to be unloaded or loaded. In sorting sidings rolling stock may be arranged into any required order or assembled into separate trains, either by shunting engines or by gravity.
- Signal
- Usually refers to any means of passing information to or from a moving train. May take the form of a fixed semaphore arm (which indicates On or Off), a coloured light, a hand-held lamp moved in a certain way, a coded whistle or any other indication, the meaning of which has been agreed in advance.
- Signal Box
- A building where signal and points operating-levers are centralised. On the LNWR signal boxes were more usually called “signal cabins”. The largest signal box on the LNWR was Euston No.2 (opened 1891) with 288 mechanical levers, one of the largest in the country, but other important signal boxes might have over 100 mechanical levers and two or more signalmen to work them.
- Signalman
- A person employed in operating a signal box. Often referred to colloquially as a ‘Bobby’, derived from the earliest function of the signalman as a railway policeman.
- Single Line
- Another term for single track.
- Single Track
- A railway route where only one track is provided for both directions of travel.
- Single Wheeler
- A generic term for a locomotive with a single (often very large) driving wheel.
- Six foot
- Commonly used term for the space between two adjacent tracks.
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