We supply a wide range of steel H-beams (also known as RSJs or Universal Columns).
Steel specification: S355JO British Standard: BS EN 10025/10034/10365 BS4-1.
We can provide you with: 
1) 203 x 203 H-beams, suitable for 100-160mm thick railway sleepers
2) 152 x 152 H-beams, suitable for 100-125mm thick railway sleepers
3) 127 x 76 I-beams, suitable for 100mm thick railway sleepers.

H-Beam, I-Beam and U-channel Lengths include 1.2m. 1.5m, 1.8m, 2.1m, 2.4m, 2.7m and 3.0m. 
We are also able to cut to size longer lengths, and specific sizes.