Editing Union Pacific Railroad (section)

===Locomotive roster===
As of December 2023, the Union Pacific had 7,175 locomotives on its active roster consisting of 42 different models.<ref>{{Cite web |date=December 2023 |title=Union Pacific Locomotive Roster |url=https://www.up.com/aboutup/funstuff/locomotive-roster/index.htm |url-status=live |archive-url=https://web.archive.org/web/20240104211824/https://www.up.com/aboutup/funstuff/locomotive-roster/index.htm |archive-date=4 January 2024 |access-date=19 March 2024 |website=UP.com}}</ref>
{| class="wikitable sortable"
|-
! Type !! Quantity
|-
| [[GE Dash 8-40C|C40-8]]|| 3
|-
| [[GE Dash 8-40CW|C40-8W]]|| 7
|-
| [[GE Dash 8-40CW|C41-8W]]|| 28
|-
| [[GE Dash 9-44CW|C44-9W]]|| 217
|-
| [[GE AC4400CW|C44AC]]|| 511
|-
|[[GE AC4400CW#Rebuilds|C44ACCTE]]
|543
|-
|[[GE AC4400CW#Rebuilds|C44ACM]]
|655
|-
| [[GE Evolution Series#ES44AC (2003–present)|C45ACCTE]]|| 937
|-
|[[GE Evolution Series#ES44AC (2003–present)|C45AH]]
|465
|-
|[[Remote control locomotive#North America|CCRCL]]
|6
|-
|[[EMD E9|E9]]
|2
|-
| [[EMD GP15-1|GP15-1]]|| 46
|-
|[[EMD GP15#Rebuilds|GP15N]]
|22
|-
|GP22
|10
|-
| [[EMD GP38-2|GP38-2]]|| 85
|-
| [[EMD GP38-2#Rebuilds|GP38N]]|| 167
|-
| [[EMD GP39-2|GP39-2]]|| 10
|-
|[[EMD GP39-2#Rebuilds|GP39N]]
|7
|-
| [[EMD GP40-2|GP40-2]]|| 61
|-
|[[EMD GP40-2#Rebuilds|GP40N]]
|129
|-
|GP59ECO
|1
|-
| [[EMD GP60|GP60]]|| 137
|-
|GP60E
|33
|-
|GP62
|16
|-
| [[EMD MP15AC|MP15AC]]|| 1
|-
|PS4B
|1
|-
|PS6B
|67
|-
|RP18G
|14
|-
| [[EMD SD40-2|SD40-2]]|| 2
|-
|[[EMD SD40-2#SD40N|SD40N]]
|486
|-
|SD59MX
|28
|-
| [[EMD SD60|SD60]]|| 45
|-
|SD60E
|1
|-
| [[EMD SD60|SD60M]]|| 132
|-
|SD62
|18
|-
|SD62E
|13
|-
| [[EMD SD70 series#SD70ACe (2004–present)|SD70ACe]]|| 510 
|-
|[[EMD SD70 series#SD70ACe-T4 (2015–present)|SD70AH]]
|368
|-
| [[EMD SD70 series|SD70M]]|| 1,365
|-
| [[EMD SD90MAC|SD9043AC]]|| 23
|-
| SNOW PLOW|| 1
|-
|STEAM
|2
|}

====Heritage equipment====
{{Main|Union Pacific heritage fleet}}

Union Pacific continues to use a small number of "heritage" steam locomotives and early streamlined diesel locomotives. This equipment is used on special charters (excursions).<ref>{{Cite web |title=UP: Steam |url=https://www.up.com/aboutup/special_trains/steam/index.shtml |access-date=September 7, 2018 |publisher=Union Pacific}}</ref><ref>{{Cite web |title=E-9 Streamliners |url=https://www.up.com/aboutup/special_trains/diesel-electric/e9_streamliner/index.htm |access-date=September 7, 2018 |publisher=Union Pacific}}</ref>
{| class="wikitable sortable"
|-
! Type !! Quantity
|-
| [[4-8-8-4]] [[Union Pacific Big Boy|Big Boy]]|| 1
|-
| [[4-8-4]] [[Union Pacific FEF Series|FEF-3]]|| 1
|-
| [[EMD E9|E9A]]|| 2
|-
| [[EMD E9|E9B]]|| 1
|}
[[File:UP 4014 Friesland, WI (48379660372).jpg|thumb|Big Boy #4014 passes through [[Friesland, Wisconsin]], on July 25, 2019.]]

====Low-emissions locomotives====
Union Pacific maintains a fleet of low-emissions locomotives. Most are used in Los Angeles basin rail yards, to satisfy an air quality agreement with the local authorities.<ref>{{Cite web |title=New Ultra-Low Emission Locomotive Goes to Work in Union Pacific's Los Angeles Basin Rail Yards |url=https://www.uprr.com/newsinfo/releases/environment/2007/0131_ultralow.shtml |access-date=January 19, 2017 |publisher=Union Pacific}}</ref><ref>{{Cite journal |last=Guss |first=Chris |date=August 2018 |title=Few flowers for gensets |journal=[[Trains (magazine)|Trains]] |volume=78 |issue=8 |pages=18–19 |id={{ProQuest|2056018178}}}}</ref>[[File:UNION PACIFIC Y2513 20070228.jpg|thumb|One of the 20 new {{convert|2000|hp}} "[[Railpower GG20B|Green Goat]]" locomotives manufactured for Union Pacific's "Green" Fleet by [[Railpower Technologies]]]]
{| class="wikitable sortable"
|-
! Type !! Quantity
|-
|[[NRE 2GS14B|2GS14B]]|| 1
|-
|[[Progress Rail EMD24B|GP22T4]]|| 10
|-
|[[MPI MP20B|MP20B]]|| 13
|-
|[[3GS21B]]|| 59
|-
|[[Progress Rail PR30C|PR30C]]|| ≥6
|-
|[[GG20B|GG20GE]]||21
|-
|Others|| ≤71 
|}