Types - Trains de l'Union Pacific
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 Union Pacific Trains and Engines

Union Pacific Trains and Engines

Union Pacific from 1862 to 1960 - Unofficial
 Union Pacific Trains and Engines
Situation : Home » Steam locomotives » Types


The main types of steam locomotives available to the Union Pacific. They are given according to the classification American White Notation.
Wherever possible the images are pictures of official presentation.

Link to list of all the steam locomotives of Union Pacific since 1915 by date

Image 0-4-0 Four-coupled
U.P.R.R. N° 3
C'est une 0-4-0 saddle tank c'est à dire que le réservoir d'eau est placé sur la chaudière comme une selle de cheval.

Image 4-4-0 American, Eight-wheeler
Le type American fut le plus courant durant la seconde moitié du XIXième siècle aux USA.

Image 4-4-2 Atlantic
The Atlantic was an engine speed for the passenger service. That is why it had wheels of large radius. She preceded in this role the Pacific that quickly replaced it. They appeared in the 1890s and quickly found themselves inadequate to draw new passenger heavier steel coaches  replacing wooden ones.

Image 0-6-0 Six-coupled
Switcher: locomotive for yard operations. The standardized USRA 0-6-0 (only some for the UP) was the smallest model of this normalization, which was enacted during the First World War to save costs.

Image 2-6-0 Mogul
U.P.R.R N° 7
Ce type a existé dans compagnie StJ&GI series 40 à 45

Image 4-6-0 Ten-wheeler

Image 4-6-2 Pacific
Locomotive de vitesse destinée aux trains de voyageurs. Elle succéda les Atlantic(s) et précéda les Hudson(s) (dont aucune ne fut commandée par L'UP) et les Mountain(s) et Northen(s) dans ce rôle.

Image 2-8-0 Consolidation

Image 2-8-2 Mikado

Image 4-8-0 Twelve-wheeler

Image 4-8-2 Mountain

Image 4-8-4 Northen
The Union Pacific had three classes called Northen FEF (Four Eight Four)
FEF-1 # 800-819 1937, ALCO builder
FEF-2 # 820-834 1939, ALCO builder
FEF-3 # 835-844 1945, ALCO builder, same class as FEF-2 but built after war with substitutions of materials due to the war.
These locomotives were originally intended primarily to passenger service with speed up to 100 m/h cruising speed and have even reached 110 m/h but were overcome by diesel locomotives and were then used as locomotives for freight trains . The locomotive numbered 844 (ex #8444) was retained and is sometimes used to "excursion" train.

Image 2-10-2 Santa Fe
TTT-1 to TTT-6 class (TTT : two ten two 2-10-2)

Image 4-10-2 Overland
Freight service locomotive. The needs of power before needing to use multiple units in several locomotives simultaneously for a convoy of which the quest for power to be replaced by this model. This model preceded the 4-12-2 to be even more powerful.
These are three-cylinder locomotives, then rebuilt in two-cylinder engines to simplify maintenance, in fact, the effort on the rods was otherwise too high.

Class TTF-1 (TTF: four ten two: 4-10-2)

Image 4-12-2 Union Pacific
Locomotive for freight trains. This was one of the last attempts to increase the number of axles for locomotive rigid. Indeed the needs of power previously required to use multiple units ie several locomotives simultaneously for a convoy of which the quest for power to be replaced by this model and after that to have articulated locomotive to limit costs.
These are three-cylinder engines with the third attack the second axle from which the largest gap between the first two axles and thereafter. This also allowed not to have a first drive axle elbow that was more fragile (having a bent axle or not remains debated).

Image 4-6-6-4 Challenger
This type of locomotive was developed by the Union Pacific on the basic model articulated Mallet. They were built between 1936 and 1943. They correspond to the model Mallet by being articulated, but all cylinders are directly powered by live steam at high pressure while in the model Mallet both are trained by the steam at high pressure and two steam recycle more low pressure. This gave more power to the hook with more consumption of fuel with a lower efficiency that was not the main concern. The articulated model can take tighter curves. The Union Pacific was 105 Challengers and other companies had also. We solved this model of behavior problems in high-speed line for the geared locomotives and then allowed it to build even larger locomotives and fast like the 4-8-8-4 Big Boy.

There were two models which had the second largest centipede tender.

One,  No 3985,  , is kept in working order by the Union Pacific in Cheyenne Wyoming, and is the largest locomotive in running the world. She served excursion tours until 1990.

Image 2-8-8-0 Bull Moose

Image 2-8-8-2 Chesapeake
Les 2-8-8-2 de L'Union Pacific proviennent de plusieurs classes.

Une classe propre à l'Union Pacific
OWR&N (appartenant à l'Union Pacific) : classe MC-1 de 1909 : 3 unités :N° 2000-2002

Deux classes utilisées en leasing durant la seconde guerre mondiale provenant d'une part
C&O (Chesapeake & Ohio) : classe H7 de 1924 : 30 unités : N° 3570 à 3599

et d'autre part
N&W (Norfolk & Western) : classe Y3a de 1919: 4 unités : N° 3671 à 3674 récupérée par l'Union Pacific en 1945
Ces locomotives furent utilisées pendant la guerre par nécessité mais n'étaient pas considérées comme assez rapide et ralentissaient le trafic. Leur usage n'a donc pas perduré longtemps près la guerre.

Plus de détails...

Image 4-8-8-4 Big Boy

L'Union Pacific eu 3 Shay N° 59,60 et 61

Image Shay 28 2B

Image Shay 65-3C

Image Shay 80-3C