THOMAS & FRIENDS™ NARROW GAUGE RUSTY ENGINE (diecast construction) - Runs On N Scale Track. Rusty is the only diesel engine on the Narrow Gauge Railway. He loves adventure and especially loves his two-toned horn. In the original "Railway Series" Rusty was painted charcoal-black with gold lining. He is based on a Ruston & Hornsby 4wDM narrow gauge engine. Bachmann carefully reproduces your favorite Thomas & Friends™ characters. Narrow Gauge Thomas & Friends™ products are HO models that run on N scale track. All Thomas and Friends Narrow Gauge locomotives feature electric drive mechanisms highly detailed Die Cast construction all-metal wheels and narrow gauge hook and loop couplers. Build your Thomas & Friends™ collection one friend at a time! Features Operating HO scale electric locomotive Highly Detailed Die Cast Construction All-metal wheels with factory-installed narrow gauge hook-and-loop couplers Performs best on 11.25" radius curves or greater Runs on Bachmann N scale E-Z Track® and is compatible with all popular brands of N scale track Product Measurements L 2.5 in. W 0.75 in. H 1.5 in. Retail Package Measurements L 5 in. W 1.5 in. H 4 in.