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The Model RD-20 rail transport dolly consists of two individual trolleys hooked in tandem. Each dolly features tow bar connections (ideal for use with the Geismar 360 Hi-Rail crane) and air-line quick-disconnects (for the standard fail-safe air brakes) at the front and rear of each dolly. The RD-20's 20 ton capacity will support up to 20 39-foot rails (136-pound rail).