In the Japan railway company group, rails are welded at about 80,000 points every year, of which those welded by the gas pressure welding (GPW) method account for approximately 30%, for the reason that gas pressure welds have as good performance as that of flash welds, and the GPW equipment is highly mobile due to its compactness when compared with that of flash welding. However, GPW requires special skill for grinding end surfaces and controlling oxyacetylene flame and pressure. To allow even unskilled operators to perform GPW in the future and further improve the operational efficiency, investigations were performed to simplify end surface grinding and improve gas burners and the applied pressure method used for GPW.