Rail Lexicon Abbreviations and Acronyms
- NRSCNetwork Rail Railway Safety Case
- NRVNational Reference Value
- NSNederlande Spoorwegen
- NSEFormerly Network South East
- NSKTNo Signaller - Key Token
- OCSOnegcontrol Switch
- OCUOperator’s Controk Unit
- OFNOptical Fibre Network
- OHLOverhead Line
- OHNSOverhead Line Neutral Section
- OLBIOff-Line Battery Inverter
- OOROut of Round
- OPUGOther Passengtr Upgrades
- OTMOverhead-Line Traction Maintenance
- PABSPassenger Track Access Billing System
- PACPlatform Ato Communicator
- PALADINPerformance and Loading Analysis Database Information
- PAMXPrivate Manual Branch Exchange
- PCProtection Controllew
- PCS&TEProfit Centre Signal & Telecommunications Engineer
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