#304B - O Scale - Roundhouse “Big Boy” Extension Kit

Korber Models

Regular price $55.00

Product Specification:

Product Number: 304B

Scale: O Scale

Dimensions: 6 1/2" W x 9 1/2" L x 6 1/2" T

Instructions: Coming Soon

Base Kit Required: 304 Kit

Expansions Available: 304A 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.

The kit comes complete with newly created easy to follow instructions that offer simple steps to provide a great looking roundhouse including several options that allow you to take your layout to the next level.

Additional Information:

  • Assembly Required
  • Paint/Glue not included
  • Recommended: For ages 14+
  • Made in the USA