For a long time, the 250 years of independence of the USAYou were in the shadow of the world-famous "Big Boys". The talk is of the no less impressive "Challenger" locomotives of the Union Pacific Railroad (UP). During the steam locomotive time, the Rocky Mountains fought on the important trans-continental route with steep inclines and many curves. Front-end and sliding locomotives were on the agenda particularly in goods trains. In the mid-1930s, the UP sought solutions to streamline this complex and expensive operation. The six-way coupled frame locomotives of the 9000 series were limited to a constructive limit. As a result, the UP developed a powerful "articulated" that would advance into new power ranges with two engines. The construction contract was finally awarded to the American locomotive company (ALCO), which delivered the first copies of the (2’C)C2’ h4 giants to the UP in 1936. The six driving axles powered four cylinders, each with two pre- and trailing axles per engine made it possible to install a real super-Power boiler with huge firebox. The front engine was movable and thus brought an excellent curve running. The huge steam bigger, 37 m long and weighing over 450 tons, proved to be excellent from the start. With their power of 5000 hp and a maximum speed of 110 km/h they could also be used in the heavy passenger train service. Soon the name "Challenger" was used for this successful construction. Translated means the "challenger". It should probably be said that this then ultra-modern locomotive type faces all the challenges. The UP finally obtained 105 "Challenger", which were delivered in five series between 1936 and 1944 as Class 3900. The locomotives built from 1942 were modified versions with an increased power of almost 6000 hp and a larger tender. Six specimens were given for use before express trains ex works wind deflector plates, a two-colored paint (light-gau/medium-gray) and oil firing. In addition, the UP converted many coal-fired "Challenger" to oil firing from 1941. In order to distinguish these locomotives from the coal-fired machines, some were redrawn in 3700-3717. The "Challenger" locomotives were important supports in the Union Pacific train transport industry before the end of their applications. Because of their large numbers they were hardly in the shade of the legendary "Big Boys". Moreover, the "Challenger" were universal due to their lower length. Those who would like to remind people of the great time of American railways on a model railway with enormous steam gauges will not miss the "Challenger", particularly as many other railway companies have also acquired this successful UP model. In addition, the retained Challenger 3985 was the world’s largest operational steam engine between 1981 and 2010. Heavy US-goods train steam locomotive of Class 3700 Challenger in the conversion version with oil tender of the Union Pacific Railroad (UP). Design of the locomotive with the operating number 3704. Operating condition of the 1950s. With digital decoder and a wide range of sound features. Regulated high-power drive. 6-axis drive Traction tires, smoke generator. Head end signal changes dependent upon the direction of travel, number plates and smoke generator operated conventionally, can be switched digitally. Driver's cab lighting is digitally switchable Lighting with maintenance-free warm white light emitting diodes (LED). Curve-going articulated chassis. Boxpok wheels. Minimum radius R2a (261.8 mm). Length over couplings approx. 23 cm. This model is developed in cooperation with Broadway Limited Imports. The image is a digital reink. Notes on operation: The locomotive can be used on curved tracks from a radius of 261.8 mm, but we recommend larger radii. Due to the overhang of the long vessel, signals, overhead line masts, bridge railings, tunnel portals, etc. must maintain a sufficient distance to the track bend. For the high weight of the locomotive, the track must be stable. The turntable and sliding platform can only be driven in the forward position.
This text is machine translated.