Rail Transport Abbreviations and Acronyms

1. UIC
   Union Internationale des Chemin
2. UK
   Unknown
3. UM
   Up Main
4. UML
   Up Main Line
5. UMP
   Upper Merion and Plymouth Railroad
6. UMPX
   First Union Rail
7. UN
   Unknown
8. UNFURNOTE
   Until Further Notice
9. UNK
   Unknown
10. UNKN
    Unknown
11. UO
    Union Railroad
12. UO
    Union Railroad of Oregon
13. UO
    Union Railway of Oregon
14. UP
    Union Pacific Railroad Company
15. UPBZ
    Union Pacific Railroad Company
16. UPFE
    Union Pacific Railroad Company
17. UPHZ
    Union Pacific Railroad Company
18. UPL
    Up Passenger Loop
19. UPL
    Up Platform Line
20. UPNZ
    Union Pacific Railroad Company

Last updated: May 24, 2020 — Total entries: 4,035