Märklin 37990 Sound

Union Pacific “Big Boy” 4013, Insider Model

• One-time series only for Insider members

Model Features

• Digital decoder with controllable high-efficiency drive, sound functions, and multiple auxiliary features.
• Powerful motor with bell-shaped armature and flywheel mounted in the boiler.
• 8 powered axles with 4 traction tires for maximum pulling strength.
• Articulated frame for smooth operation through tight curves.
• Authentic Boxpok wheels.
• Spring-mounted center driving axles for improved running performance.
• LED lighting for headlights, tender lights, and number boards (maintenance-free).
• Prepared for 2 smoke generators (Seuthe No. 11), with contacts permanently installed.
• Lighting functions (headlights, number boards, cab lighting) operate conventionally and are fully digitally controllable.
• Digital sound suite including steam chuffs synchronized to speed, bell, whistle, brake squeal, and acceleration/brake delay.
• Additional sound effects available when operated with a Central Station (60212).
• High-quality speaker in the tender with adjustable volume.
• Close coupling between locomotive and tender; coupler hooks included for both ends.
• Hinged steam lines connected to the cylinders for realistic appearance.
• Rich detailing with separately applied metal grab irons and numerous fine components.
• Figures included: locomotive engineer and fireman for the cab.
• Length over buffers: 46.5 cm (18-5/16").
• Delivered in a premium wooden case.

History, Union Pacific Big Boy 4013

One of the legendary Union Pacific “Big Boy” 4‑8‑8‑4 articulated steam locomotives, No. 4013 belongs to a class of 25 built by ALCO in the early 1940s to handle the heaviest mainline freight over steep mountain grades. Designed for immense tractive effort and sustained high power, the Big Boys could move long, heavy trains where smaller engines struggled — making them engineering icons of North American railroading.

Key points

• Type: 4‑8‑8‑4 articulated steam locomotive (Big Boy)
• Builder: ALCO (early 1940s)
• Role: High‑power heavy freight over mountain grades; long‑haul mainline service
• Power & design: Massive boiler, articulated frame and large driving wheels for both traction and stability under load
• Service life: Intensive wartime and postwar freight duty through the steam era; retired with dieselisation in the 1950s–60s
• Legacy: Few examples survive in preservation; the Big Boy series remains an enduring symbol of American steam power and a must‑see for enthusiasts

History, Union Pacific Big Boy 4014

Union Pacific “Big Boy” 4014 – The World’s Largest Operating Steam Locomotive

UP 4014 is a fully restored 4-8-8-4 “Big Boy” steam locomotive, originally built in 1941 by the American Locomotive Company. Designed for hauling heavy freight through the Wasatch Mountains, it served the Union Pacific until 1961, after which it was placed on public display in California.

Reacquired by Union Pacific in 2013, No. 4014 underwent an extensive restoration at the UP Steam Shop in Cheyenne, Wyoming. In 2019, it ran under its own power for the first time in nearly 60 years—making it the largest operational steam locomotive in the world, and the only running Big Boy of the eight preserved.

Today, UP 4014 operates in special excursion service as part of the Union Pacific Heritage Fleet..

# 1073