The David Round RailRunner Tractor Drives can handle loads ranging from 1,000 to 30,000 pounds with travel speeds reaching up to 300 feet per minute. These drives come equipped with four universal flanged trolley wheels and a spring-loaded rubber drive wheel. They are designed for use with both tapered and flat-flange beam styles and feature heavy-duty chain/sprocket drive systems. The power supply is 240/360V at 60Hz, with a 30-phase configuration. Manufactured in the USA, most items can be shipped from stock immediately. Various track widths are available, allowing for customization to accommodate specific travel speed and space requirements. Additionally, options include Explosion Proof (EX) ratings, enclosed tracks, free-wheeling capabilities, and stainless steel construction. Please contact us for more details on these features. Shipping costs are determined by the FOB Shipping Point method, with possible steel surcharges applicable.