Laying method for superconducting feeder cable along railway line

The superconducting feeder cable shrinks in cooling process from the room temperature to the temperature of liquid nitrogen. When a long superconducting feeder cable is constructed in a railway line, it is needed to consider countermeasures against the cable shrink due to cooling force. We report on a suitable method of laying the cable in 300-m class on the test track. We also report that the method is suitable for this cable because no buckling and rupture points were observed in the X-ray radiograph taken over the whole length of the cable after its installation.