Korber #304B - O Scale - Roundhouse “Big Boy” Extension Build Up

Korber Models

Regular price $144.95

Product Specification:

Product Number: 304B
 Scale: O Scale
 Dimensions: 15" Front, 28.5" Back, 30" Deep
Expansions Available: 304 Build Up304A Build Up
Un-Assembled Kit: 304 Kit, 304A Kit, 304B Kit


Add more depth to a stall of a Korber 304 roundhouse to accommodate extra-long engines such as the Big Boy.

The Korber Roundhouse “Big Boy” extension includes molded brick details, laser cut windows and a real wood internal support structure to bring life to your model railroad.

 This kit has been upgraded with new laser cut windows featuring detailed mullions, real wood laser cut doors.  Walls are molded in a red brick color to provide extra detail. 

The Korber 304B "Big Boy" extension adds a three sided "shed" to the back of a stall in a roundhouse to create extra room for the larger engine.

Additional Information:

  • Recommended: For ages 14+
  • Made in the USA