The Union Pacific Railroad has been known throughout the years as a major operator of neat and diverse steam engines. Let's take a look at some of the most unique of these engines:
Canadian Pacific-cloned Power
In the early 1930s, the Canadian Pacific and Union Pacific collaborated with each other on various locomotive designs modified to their respective preferences. During this time, the Canadian line received several carbon copies of the CSA-3 Challengers and the 9000 Series 4-12-2s for use in Canada. As well as several clones of the FEF-3 series 4-8-4s for use.
Diagram of the Canadian Pacific Q1 Class 2-8-4s, known as Laurentians. Which directly inspired the Union Pacific TEFs, and shared many components with the Hudsons. Canadian National had also built some 2-8-4s from ex-GTW Consolidation in the 1930s.
Union Pacific also received several CP designs in this case. Namely, the FSF Class 4-6-4s and the TEF Class 2-8-4s, both of which were intended for operations on the lines from Utah to the Pacific Northwest. Both engines were superb, the latter having been built directly with the same boiler as the Hudsons like what was the case on the Canadian Pacific. Both engines were especially adept to the Pacific Northwest, and the FSFs were painted in a livery very similar to that of the
Challenger passenger train.
In addition, the Union Pacific considered order other famous Canadian Pacific designs. Specifically the Selkrik 2-10-4s and their cab-forward cousins, the Connaught 4-10-2s. However, these did not come to pass due to most of the freight needs being handled by stronger articulateds. Not to mention the aforementioned TEF 2-8-4s also built from Canadian Pacific designs.
Passenger Engines
The Canadian Pacific K1b, had it been cloned for Union Pacific, would be among the few truly streamlined Union Pacific engines along the FSF engines. Indeed, many artists have drawn what-ifs of these engines as UP engines with smoke deflectors and different paint. Much like with the Selkirks above.
As was the case with most American railroads, UP operated most of the mainline passenger trains with 4-8-4s. Whereas shorter trains were usually hauled by 4-6-2s. Today, this is still the case. Albeit with the FSF 4-6-4s, built from CP Royal Hudsons, now playing major roles in some parts of the network. Mainly to the west from Utah to the Northwest or Los Angeles. In addition, the Union Pacific had considered ordering some clones of the Canadian Pacific's K1b Class 4-8-4s to serve as streamlined equivalents for use on the streamliners to either the Pacific Northwest or California.
Articulateds
Big Boy 4010 is one of the numerous Union Pacific Articulateds preserved today. However, it will likely not run again due to being stuffed and mounted in a park in Omaha alongside a Centennial diesel.
Further east was the stomping ground of the iconic articulated types that made Union Pacific famous. Here, all the Challengers and Big Boys strutted their stuff hauling the heaviest freights west to Utah and east as far as Cheyenne or Denver. These engines would ultimately be among the last Union Pacific steamers in operation, and spent their last years on helper duty when not hauling freight.
Other Freight Engines
TTT-6 #5511 finished service as a helper in the Cheyenne area until eventual retirement. Today however, she works for the Steamtown Railroad Museum as an excursion engine. Which is because she is more than ideal for the slow, leisurely excursions through mountainous terrain.
In addition, smaller engines would pop up from time to time. Of particular note were the helpers in the form of 2-10-2s. These engines were not very fast, but still were perfectly capable of the needed jobs. Secondly, the 9000 Class 4-12-2s, while confined to the Plains typically, were also helpful. So much that after discovering that #9012, having been sent for display in California, could actually go well out west, the original 9000 was used in their iconic heritage program.