| CDI | Common rail Direct Injection |
| FOR | Free On Rail |
| AR | All Rail [engl.] Transport nur auf der Schiene |
| f.o.r. | free on rail |
| ZUR | Raleigh Rail Station USA, North Carolina [Internationaler Airport Code] |
| REA | Rail Express Agency |
| BNJ | Bonn Rail Station Deutschland [Internationaler Airport Code] |
| BR | British Rail [engl.] Britische Eisenbahnen |
| GLI | Rail Europe Deutschland GmbH |
| HSR | High Speed Rail [engl.] Hochgeschwindigkeitsverkehr bei Eisenbahnen |
| ERCG | European Rail Catering Group |
| ERFA | European Rail Freight Association [engl.] Europäischer Schienengüterverkehrsverband, Brüssel, http://www.erfa.be |
| CARE | City Airport Rail Enterprises [engl.] Bahnbetreiber in London |
| ERTMS | European Rail Traffic Management System |
| BRBS | British Rail Business Systems [engl.] Tochterunternehmen von British Rail [vormals Britische Staatsbahn] |
| ALRV | American Light Rail Vehicle [engl.] Versuch einer Standardisierung amerikanischer Strassenbahnwagen |
| CN | Common Name |
| MIC | Mode Indicate Common |
| CXI | Common X Interface |
| OCC | Other Common Carrier |
| CAI | Common Air Interface |
| CMB | Common Management Bus |
| COMHED | Common Header |
| BCE | Before the Common Era [substitute for BC] |
| CORE | Common Runtime Environment |
| COE | Common Operating Environment |
| CUA | Common User Access |
| CFM | Common Functional Model |
| CNI | Common Network Interface |
| CNRP | Common Name Resolution Protocol |
| CLF | Common Logfile Format |
| CVE | Common Vulnerabilities and Exposures |
| CEM | Common Evaluation Methodology |
| COMAL | Common Algorithmic Language |
| CLR | Common Language Runtime |
| CPI | Common Part Indication |
| CTS | Common Type System |
| CPL | Common Public License Open-Source-Lizenz |
| CPT | Common Point of Trust |
| CLI | Common Layer Interface |
| CMC | Common Mail Call |
| CSE | Common Subexpression Elimination |
| CSI | Common Synchronous Interface |
| CTF | Common Translation Factor |
| CIM | Common Information Model |
| CPI | Common Programming Interface [IBM] |
| CIM | Common Information Model |
| CTR | Common Technical Regulations |
| CTS | Common Transport Semantics |
| CGS | Common Graphics System |