The HO scale layout models the Colorado Joint Line as it leaves East Yard (east staging) and enters Centennial City with its large freight yard for classification and major passenger station switched by the Centennial City Union Terminal RR. Trains from the ATSF, MP, RI, C&S and CB&Q use the Joint Line into Centennial City. The Rocky Mountain Line leaves the Colorado Joint Line at Centennial City on the front range of the Rockies and heads west into Utah across the great divide. Traversing west from Centennial City the line soon encounters a 2% helper grade to the centennial divide. The divide itself is crossed through the Muppet Tunnel. On the western slope a gentler 1% grade is maintained with the modeled portion of the line ending at Punston Yard (west staging). There are two important branch lines. The Dragerton Branch operated by the Goldpin Tramway extends to the Blue Valley mining district and the Columbine Branch operated by the Columbine Coal Company is a major source of coal traffic. The RML is owned by the CB&Q and is greatly influenced by the parent company. However, the RML maintains its own paint schemes and many non-Q locomotives are on the roster. The timeframe is set in the ‘50s and both steam and diesels are present. Being one of the most scenic routes in America there is heavy passenger traffic, including the California Zephyr. The operating system is Digitrax. An operating CTC system controls the traffic flow from the Dispatchers computer using Digitrax hardware and JMRI/CATS software.