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admin 05.07.2015

With a digital decoder, controlled high-efficiency propulsion, sound effects generator, and auxiliary functions.
The Union Pacific Railroad (UP) class 4000 known as the "Big Boy" is surely one of the most popular steam giants in America if not worldwide. Due to the overhang of the long boiler, signals, catenary masts, bridge railings, tunnel portals, etc. These articulated locomotives with their 4-8-8-4 wheel arrangement had their origin in 1941 at ALCO from the continuation of the "Challenger" concept, extremely successful UP articulated steam locomotives with a 4-6-6-4 wheel arrangement. The conception of the "Big Boys" resulted from the usual requirements as with all the other American classes of large locomotives. Could somone confirm this as my 91 and 93 are in there boxes?All functions are separate and can be mapped to whatever button you want. Products bearing "Union Pacific" are made under trademark license from the Union Pacific Railroad Company. On 94 the smoke generator contacts are connected to AUX3 and can therefore be assigned to another button. We would like to thank the Union Pacific Historical Society for their support in making this version of the Big Boy possible. The headlight, backup light on the tender, and the number board lights are maintenance-free, warm white LEDs.
2 smoke generators (7226) can be installed in the locomotive; the contacts for them are on constantly.
The result was a gigantic machine with a service weight of 548 tons (including the tender).


The headlight, backup light on the tender, the number board lights, and the engineer's cab lighting will work in conventional operation and can be controlled digitally. An attempt was made to reach an equal distribution of the weight with the 4-8-8-4 wheel arrangement that had not been built up to then. Headlights, number boards, and engineer's cab lighting will work in conventional operation and can be controlled digitally. Speed-dependent steam locomotive sound effects, bell sound, whistle signal, squealing brakes, as well as acceleration and braking delay can be digitally controlled with the 6021 Control Unit or with the 60652 Mobile Station. Carefully unscrew the base and remove the base carefully.The hardest part is to secure it to the base again as the foam is deeper than the engine. Additional operating sound effects can be digitally controlled with the 60212 Central Station.
You have to push the base in the foam AND find the holes for the screws and secure the screws. But, these units were not allowed to thunder through this part of the West at this speed in regular service. According to the legend these giants acquired the nickname "Big Boy" from a young worker who scribbled the name on the smoke box shortly before the locomotive was presented.
Officials from ALCO and UP liked this so much that "Big Boy" was even used in the advertising for the locomotive. On average these units consumed 47,200 liters or 12, 469 gallons of water and 22 tons of coal per hour. Of course, a fireman would have been overwhelmed if he had had to feed one of these ravenous beasts with a shovel.


A stoker moved coal from the tender to the locomotive by means of a screw in a pipe and sprayed it into the fire box with steam pressure. The fireman adjusted the distribution of the coal in the fire box by controlling the steam pressure. In the fall of 1945 the UP decided to equip a "Big Boy" with smoke deflectors as an experiment in order to keep the smoke out of the engineer's and fireman's eyes. In the beginning of December 1945 the "Big Boy" with road number 4019 had smoke deflectors installed on it at the maintenance center in Green River, Wyoming. The tests were finished on January 20, 1946 and these "large ears" were removed again in Green River. The tests had shown that at lower speeds in freight service and with recently improved blowers the smoke could be routed ever better over the engineer's cab and without smoke deflectors. The Big Boy era was definitively past in July of 1959 when the fires in all of the units were banked for good. The hope of many railroad fans to see road numbers 4003 and 4019 (stored in operational condition as reserve locomotives in 1960) thundering one more time over Sherman Hill sadly did not come to pass. At least eight of the steam locomotive giants were preserved but not in operational condition.



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