David Round RailRunner® Tractor Drives can handle loads from 1,000 - 30,000 lbs. with travel speed ranges up to 300 FPM. Equipped with (4) universal flanged trolley wheels and spring-loaded rubber drive wheel. Designed for use with tapered and flat-flange beam styles and heavy-duty chain/sprocket drive system. 240/360V - 60Hz 30-phase power. Made in the USA with most items available for shipment from stock. Available in a wide variety of track widths and easily customized for travel speed and space limitations. Also available in Explosion Proof (EX) rating, enclosed track, free-wheeling and stainless steel construction. Please call for details. FOB Shipping Point.