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The laying of CWR can be completed only if the rail has been laid in the correct temperature range. The required rail elongation depends upon the climatic conditions of the work site and the length of rails to be welded. The Model SH-4 rail heater has been designed specifically for this task and requires only one operator. The SH-4 is equipped with a removable outrigger arm that can be mounted on either side of the heater. Safety features include an adjustable flame, a check valve to regulate the fuel gas pressure, a relief valve, a pressure gauge and an instantaneous emergency cut-off valve. The propane tank is secured to the trolley at an inclined position to allow better functioning of the heater.