Marklin 37996 - Steam Locomotive with Tender 4020 Big Boy MFX+

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Scale: H0-Scale

EAN/UPC: 4001883379968

System: 3-Rail AC (Märklin).

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Prototype: Union Pacific Railroad (UP) class 4000 "Big Boy" heavy freight locomotive. Version with the road number 4020. The locomotive looks as it did around 1950.

Model: The locomotive has an mfx+ digital decoder and extensive sound functions. It also has controlled high-efficiency propulsion. 8 axles powered. Traction tires. The locomotive has an articulated frame enabling it to negotiate sharp curves. It also has Boxpok driving wheels. The middle driving axles are spring-loaded. 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 headlight, backup light on the tender, and the number board lights will work in conventional operation and can be controlled digitally. The cab lighting can be controlled in digital operation. There is a powerful speaker in the tender and the volume can be adjusted. Coupler hooks can be inserted in the pilot on the front of the locomotive. There is a close coupling between the locomotive and tender. Steam lines are mounted to swing out and back with the cylinders. The locomotive has separately applied metal grab irons. There are many separately applied details. Figures of a locomotive engineer and fireman for the engineer's cab are included.

Length over the couplers 46.5 cm / 18-5/16". The locomotive comes in a wooden case.

Station 2
Headlight(s) · · · ·
Smoke generator contact · · · ·
Steam locomotive op. sounds · · · ·
Locomotive whistle · · · ·
Direct control · · · ·
Engineer’s cab lighting   · · ·
Bell   · · ·
Warning Sound   · · ·
Sound of squealing brakes off   · · ·
Air Pump     · ·
Injectors     · ·
Auxiliary Blower     · ·
Sound of Couplers Engaging     · ·
Rail Joints     · ·
Operating Sounds 2     · ·
Cab Radio     · ·


  • Coolers of the second production run in front of the smoke box.
  • Changes to the headlight.
  • mfx+ digital decoder included.

One-time series.

The image of this model is a retouched digital image. Notes for operating this locomotive: The locomotive can be used on curved track with a radius of 360 mm / 14-3/16" or more, however we recommend larger radii. Due to the overhang of the long boiler, signals, catenary masts, bridge railings, tunnel portals, etc. must be installed for sufficient clearance on curves. The track must be well mounted due to the heavy weight of the locomotive. The locomotive can only be run through a turntable or transfer table. Products bearing "Union Pacific" are made under trademark license from the Union Pacific Railroad Company.

Car sets to go with this locomotive can be found at in the Märklin H0 assortment under item numbers Marklin 45659 and Marklin 45660. This model can be found in a DC version in the ajckids Trix H0 assortment under item number 22063.


Released in: New items brochure 2015

EAN/UPC: 4001883379968