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Märklin 37997 Union Pacific Class 4000 Big Boy Steam Locomotive

Manufacturer: Märklin
Article: 37997
Year: 2020
EAN: 4001883379975
Railway Company: Union Pacific
Class: 4000
Road Number: 4014
Gauge: H0 1:87
Era: VI
Decoder: mfx+
Length: 46.5 cm

Märklin 37997 Union Pacific Class 4000 Big Boy Steam Locomotive

Prototype: Union Pacific Railroad (UP) class 4000 “Big Boy” heavy steam freight locomotive. Version with oil firing. Road number 4014. The locomotive looks as it did in 2019.

Model: The locomotive has an mfx+ digital decoder and extensive sound functions. It also has controlled high-efficiency propulsion. 8 axles powered. Traction tires. 2 each 7226 smoke generators can be installed in the locomotive. The headlight changes over with the direction of travel. The headlight, the backup light on the tender, the number board lights, and the smoke unit contacts will work in conventional operation and can be controlled digitally. The engineer’s cab lighting can be controlled digitally. Maintenance-free, warm white LEDs are used for the lighting. The locomotive has an articulated frame enabling it to negotiate sharp curves. It also has Boxpok driving wheels. Steam lines are mounted to swing out and back with the cylinders. There is a close coupling between the locomotive and tender. 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. 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. The locomotive comes in a wooden case. Length over the couplers approximately 46.5 cm / 18-5/16″.


  • One-time series of the “Big Boy”, road number 4014, with oil firing, put back into operation by Union Pacific in the prototype.
  • Prototypical execution of the model.

One-time series.

New items brochure 2020

See at Märklin.

Categories: Era VIHOMärklinmfx PlusOwnsSteamSteam LocomotiveUnion PacificUSA