A real, complete glossary of abbreviations used throughout 3-phase traction documentation (WAP5/WAG9 locos and AC-DC 3-phase EMUs).
| Abbreviation | Real Meaning |
|---|---|
| AFM | Air Flow Meter |
| AICC | Aviation Industry CBT (Computer Based Training) Committee |
| ALG | Drive control unit |
| Amp | Ampere |
| ASC | Drive converter control |
| ASR | Drive converter |
| ATD | Automatic Tensioning Device |
| BL | Key switch |
| BLDJ | Spring-loaded switch for main circuit breakers |
| BP | Brake Pipe |
| BUR | Auxiliary converter |
| BZ-V-O-F | Buzzer for vigilance, over-speed, and fire |
| CAB | Cabin |
| CB | Circuit Breaker |
| CCTV | Closed Circuit Television |
| CEL | Central Electronics |
| CGI | Computer Graphics Interface |
| CLW | Chittaranjan Locomotive Works |
| CPU | Central Processing Unit |
| dB | Decibels |
| DC | Direct Current |
| DDA | Display Data Control |
| DDS | Diagnostic data set |
| DIA | Diagnostic Processor |
| DPI | Dots Per Inch |
| EEPROM | Electrically Erasable Programmable Read-Only Memory |
| EKR | (German) Single-Board Processor |
| FUPLA | (German) Function Block Programming Language |
| FLG | Vehicle Control Unit |
| GTO | Gate Turn-Off (switch/thyristor) |
| GUI | Graphic User Interface |
| HB | Cubicle auxiliary circuit |
| Hz | Hertz |
| I/O Signal | Input/Output Signal |
| Kbps | Kilo Bytes per Second |
| kHz | Kilo Hertz |
| kW | Kilo Watts |
| k | Kilo ohms |
| LCD | Liquid Crystal Display |
| LMS | Learning Management System |
| Loco | Locomotive |
| LSAF | Indication lamp, red, for train parting |
| LWL | Optical Link |
| MB | Mega Bytes |
| Mbps | Mega Bytes per Second |
| MCB | Miniature Circuit Breaker (also: Main Circuit Breaker — real dual usage in source) |
| MEMOTEL | Speed Recorder and Indicator |
| MICAS | Micro Control Automation System |
| MVB | Multifunctional Vehicle Bus |
| MR | Main Reservoir |
| MSC | Master Sequential Control |
| MUB | (German) Over-voltage Protection Unit |
| mW | milli Watt |
| NSR | Line Converter |
| PAN | Pantograph |
| PB | Parking Brake |
| PC | Personal Computer (Windows-based) |
| Portable Document Format | |
| ppm | Parts per million |
| PVEF | Electro-valve for braking |
| RAM | Random Access Memory |
| SLG | Converter Control Unit |
| STB | Low Voltage Cubicle Control |
| SCORM | Sharable Content Object Reference Model |
| SR | Traction Converter |
| SSC | Sub Sequential Control |
| TE/BE | Tractive Effort / Braking Effort |
| TSD | Trouble Shooting Directory |
| UBA | Voltmeter, battery voltage |
| UPS | Uninterruptible Power Supply |
| USB | Universal Serial Bus |
| VCB | Vacuum Circuit Breaker |
| WAG9 | Broad-gauge AC 3-phase locomotive |
| ZPT | Spring-loaded switch for pantograph |
Exam Focus — Real Dual Meanings & German-Origin Terms
Note that MCB carries two real, different meanings depending on context — Miniature Circuit Breaker in low-voltage circuits, and Main Circuit Breaker in high-voltage contexts; the surrounding sentence decides which. Several abbreviations are explicitly noted as German-origin technical terms, reflecting the ABB/German engineering heritage of WAP5/WAG9 technology: EKR (single-board processor), FUPLA (Function Block Programming Language), and MUB (over-voltage protection unit).