| Railroad Name: | Union Railroad |
| Logo Filename: | Union_Railroad_%28Pittsburgh%29_Logo.gif |
| Marks: | URR |
| Locale: | Allegheny County, Pennsylvania |
| Start Year: | 1896 |
| End Year: | present |
| Hq City: | 1200 Penn Avenue, Suite 300, Pittsburgh, Pennsylvania, 15222 |
Union Railroad is a Class III switching railroad located in Allegheny County in Western Pennsylvania. The company is owned by Transtar, Inc., which is a subsidiary of Fortress Transportation and Infrastructure Investors, after being acquired from U.S. Steel in 2021. The railroad's primary customers are the three plants of the USS Mon Valley Works, the USS Edgar Thomson Steel Works (blast furnaces, basic oxygen steelmaking, and continuous slab casting), the USS Irvin Works (hot and cold rolling mills and finishing lines) and the USS Clairton Coke Works (producer of coke for blast furnace ironmaking).
Andrew Carnegie had been discussing rail transport with other lines, but determined the best way to protect his interests was to control the rail line himself. Several smaller companies had constructed sections of the route. "Bear Creek Railroad (name changed to Shenango and Allegheny Railroad Co.) was incorporated in March 1865 for the purpose of moving coal 21 miles from Pardoe to Shenango for delivery to other railroads and the Erie Extension Canal. By 1883, Shenango and Allegheny had extended north to Greenville, Pennsylvania, and south to Butler, Pennsylvania. By 1892, the line had extended north to reach the port of Conneaut, Ohio. The extensions carried their own descriptive corporate names and survived a series of corporate reorganizations to become the Pittsburgh, Shenango and Lake Erie." The rail line had been completed as far as Butler, still 40 miles distant from the Mon Valley. The first ore boat arrived in Conneaut in 1892 stimulating the interest of Andrew Carnegie. In April 1896, a tri-party agreement between PS&LE, Union Railroad Company and Carnegie Steel Company called for construction of a line from Butler to East Pittsburgh. The Butler and Pittsburgh Railroad Company incorporated April 8, 1896 and completed, spectacularly, by October 27, 1897 including a long, single track bridge across the Allegheny River. Also in 1897, PS&LE and B&P were consolidated into the Pittsburgh, Bessemer & Lake Erie under majority ownership of Carnegie. The Union Railroad or as some call "railroad in the sky" was created 1896. The railroad, as it exists today, has resulted from the union of five different railroads between the years 1906 and 1915. The original URR extended from East Pittsburgh to Hays, a distance of six miles, and was constructed in the years 1894–1907.
Four years later, Carnegie formed the Bessemer and Lake Erie Railroad under this exclusive ownership and arranged to lease PS&LE for 999 years. This arrangement stayed in place with the formation of U. S. Steel in 1901, which bought out Carnegie interests.
The Union was expanded to include the several other mills in the Mon Valley Region. The Union was responsible for the various switching task within each mill, for delivering raw materials to each mill (which would arrive on the Union via interchange with the Bessemer & Lake Erie, another US Steel owned and operated railroad) and for delivering the finished products to interchange with the major railroads in the area (most notable the Pennsylvania, the Baltimore & Ohio and the Pittsburgh & Lake Erie).
In 1906, B&LE leased, and later sold, to Union Railroad the portion of line between North Bessemer and East Pittsburgh.
At its peak, the Union served eight separate steel mills and numerous other businesses (see below for complete list)- USS Homestead, USS Rankin, USS Edgar Thomson, USS Duquesne-National, USS National Tube & Pipe, USS Clairton, the relatively new USS Irvin rolling mill and Grant Steel in Duquesne, Pennsylvania. The URR also used four bridges crossing the Monongahela River - Union Railroad Port Perry Bridge, Union Railroad Clairton Bridge, McKeesport Connecting Railroad Bridge (also known as: Union Railroad Riverton Bridge), Carrie Furnace Hot Metal Bridge (also known as: Union Railroad Rankin Hot Metal Bridge) - and was one of the busy railroads in the United States by tonnage hauled. Unlike the rest of the steel industry, the Union was relatively accepting of modernization as demonstrated by construction of a then state-of-the-art yard and dispatching center in Duquesne, Pennsylvania, in the early 1950s. With the decline of the steel industry in the United States, the Union's operations were greatly scaled back.
Today main transportation is iron ore from North Bessemer interchange. Edgar Thomson gets it coke from the Clairton works that is also interchanged to Dexter yard, slabs from Edgar Thomson to Irvin works and finished steel products (coils) from Irvin works to the interchanges. Only the Port Perry Bridge remains open for rail traffic. For inner-mill service the Edgar Thomson plant uses US Steel own EMD-switchers to move the hot metal subs and for tressel unloading. Crews from the URR have their own motive power EMD's for general switching duties within the mill. Their duties include the movement of loaded ore and coke cars to the staging yard and tressel, spotting and pulling the caster and slab mills, along with bringing in scrap and flux cars into the BOP "Basic Oxygen Process". After closing the Riverton bridge in 2008 there is no rail connection between the URR network and Mckeesport Tubular Operations "Camp Hill". Using URR motive power to switch McKeesport Tubular is the duty of McKeesport Connecting Railroad (MKC), another subsidiary of Transtar. The Duquesne Coal Docks are still in operations unloading scrap metal from barges to be used at Edgar Thomson and coal barges to interchange with Norfolk Southern in the Kenny Yard.Union Railroad continues to serve the Mon Valley and have since expanded its customer base to include Dura-Bond pipe coating in the former Duquesne Works site and General Electric in West Mifflin hauling special oversize generators.
Prior to 1980 Reading from the northernmost point south.
The Union RR has operated a number of locomotives over the years. In steam days, the railroad was the only operator of 0-10-2 During the steam days it also was known to run 2-8-0 "Consolidations" and 0-6-0. The 0-6-0 were built by Lima and were significantly heavier than the USRA 0-6-0. In its height of operation, as much as 115 locomotives operated at once, including the current 33 locomotives on the roster. Among the more notable steam locomotives on the Union Railroad roster was engine 95 a 2-10-0 that was the most powerful locomotive built at its time (1895). Engine 115 a 2-8-0 appeared in a few promotional pictures for local charities. Common 0-6-0 switchers included engines 77, 118 (built by Baldwin), 119, 120 and 163. Oversized 0-6-0s were built for the railroad in 1936 by Lima and included engines 187 and 188. There were 6 of these ordered. Most Union Railroad 0-6-0 switchers did not have the sloping tenders (although a few did) but maintained a traditional designed tender (for non switchers). The famous 0-10-2 "Unions" were built by Baldwin and were numbered 301-310. From 1941 until 1953 the URR would gradually replace their fleet of steam locomotives with diesel motive power.
| Road Number | Model | |
| 451-454 | ALCO S-1 | |
| 455-476 | EMD SW1 | |
| 500-505 | Baldwin VO-1000 | |
| 506-535 | ALCO S-2 | |
| 536-537 | ALCO S-4 | |
| 541-560 | EMD NW2 | |
| 571-574 | EMD SW7 | |
| 575-587 | EMD SW9 | |
| 601-612 | ALCO RS-2 | |
| 613-624 | Baldwin DRS-6-6-1500 | |
| 625-627 | Baldwin AS-616 | |
| 701-704 | EMD TR5A/B |
In the years after 1970 some used engines (eleven EMD SW9 and six EMD SD9 from the DM&IR, five SD38-2 from the B&LE and few from other roads) and three new EMD SW1001 joined the URR.
The current roster is made up completely of second generation EMD Switcher Units. Majority of the switchers are painted blue but numerous units are painted different colors including #3 and #17 are painted green, while #1 and #33 have a new yellow and red scheme.
| Road Number | Model | |
| 1-9 | EMD SW1500 | |
| 10-33 | EMD MP15DC |
The Union Railroad was unique given that it was basically a switching railroad and yet its loads were incredibly heavy made up of either; ore, coke, coal, slag or steel. This unique combination in addition to the steep grades around Pittsburgh demanded some special tractive force. In 1898 the largest locomotive of the time was built for the Union Railroad. This 2-8-0 had more weight on its drivers (208,000 pounds) than any built up to that time.[2] This was locomotive 95 in the U.R.R. stable and according to the article was built by Pittsburg(h)(sic) Locomotive Works.In the 1930s the Lima Locomotive Works began to build oversized 0-6-0s for use on the URR. These were among the largest 0-6-0s ever built.The 0-10-2 wheel arrangement was named the Union type after the railroad and produced over 100,000 pounds of tractive effort. Built for the Union RR by the Baldwin Locomotive Works, they boasted the title of "largest steam switch locomotive ever produced". The Union RR took delivery of 10 such locomotives. Only one survives today and is on static display in Greenville, Pennsylvania, painted as Duluth, Missabe and Iron Range (DM&IR) #604.