This is the Walthers 3-Stall Modern Roundhouse Addition for HO scale model railroads, with the Cornerstone Part# 933-2901. The kit measures 16 x 20-1/8 x 5-1/2 inches (40.6 x 51.1 x 14 cm). It's a great way to expand the 3-Stall Modern Roundhouse on your HO layout. Even if you're into the diesel era, this kit can be the center of your servicing facility as some classic roundhouses are still used for diesel servicing today. Workers can easily inspect and service locomotives under cover, no matter the weather. The size of the roundhouse was based on the engine traffic in a 24 - hour period, and the busiest terminals needed full - circle roundhouses. This add - on kit has three stalls on a 10 - degree center without side walls, allowing you to expand your Modern Roundhouse. It comes with realistic details like interior and exterior brick walls, fine windows, and floor inspection pits. Locomotives up to 125 scale feet long can fit inside, and there are parts for a single 145 - foot long stall, suitable for large locos. If you have a big steam fleet, you can easily expand the Modern Roundhouse (933 - 2900, sold separately) using this addition. It's an authentic North American prototype, includes decal signs, and lets you expand the roundhouse to a full circle.

Using this Walthers 3 - Stall Modern Roundhouse Addition is easy. First, make sure you have the main Modern Roundhouse (933 - 2900, sold separately). Then, attach the three stalls from this kit to the main building according to the instructions. You can place locomotives up to 125 scale feet long inside the regular stalls, and use the parts for the 145 - foot long stall if you have larger locos. When handling the kit, be careful not to break the fine window details or the decal signs. To maintain it, keep it in a dry place to prevent the brick details from getting damaged. If there's dust on it, you can gently use a soft brush to clean it. This way, your roundhouse addition will look great on your HO scale layout for a long time.