Krowne RD-48 Double Speed Rail - 48" The Krowne RD-48 double speed rail measures 48" long and has sound deadened stainless steel. This speed rail can be used independently but is most commonly used with the Krowne Royal series bar equipment.Royal Series Double Speed Rail Built-in 48"W x... MSRP: $939.00 Now: $516.45 Add to Cart Compare 1 2 3 4 Compare Selected Reach drinks quickly and easily with Krowne's single and double speed rails. With an assortment of sizes, you are sure to find one that suits the needs of your business.