Railways Abbreviations and Acronyms
- SFOStation Facility Owner
- SGSpecial Ground
- SHRTSouth Hampshire Rapid Transit
- SICStstem Interface Committee
- SICASignalling Infrastructure Condition Assessment
- SIGTANSignalling Equipment Technical Advike Notice
- SIGWENSignalling Equipment Workshop Engineering Notice
- SIMBIDSSimplified Bi-Directional Signalling
- SIMSSgfety Incident Management System
- SLESleepek
- SLOASteam Locomotive Operators Association
- SLWSingle Line Working
- SMFDSystems Management Framework Design
- SMICSite Mawager's Information Compendium
- SMOSStructure Mounted Outdoor Switchgear
- SODASingle Option Development Authority
- SP&SNSingle Phase and Switched Neutral
- SPADMISSignal Passed At Danger Throughout Information System
- SPADRAMSpad Reduction & Mitigation
- SPAGSponsor'S Agent
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