Heavy steel rail: 1. Brand Steel Rail in China 2. GB-181-1963 standard 3. Material: Q235 / 71Mnk modelsize(mm) A XB X C X Dweight(kg/m)length(m)38kg/m134x114x68x1338.736, 8, 10, 12, 2543kg/m 140x114x70x14.5 44.656, 8, 10, 12, 2550kg/m 152x132x70x15.5 51.516, 8, 10, 12, 2560kg/m 176x150x73x16.5 60.646, 8, 10, 12, 25 Standard Heavy Steel Rail