This collection of rails is a little different from normal rails. Any carts travelling on these rails can travel 2.5 times faster than normal, but only in a straight line. Additionally, attempting to leave these rails without first slowing down will likely result in death and destruction. Collisions are bad too. Please sign the wavier before boarding. More information can be found here.
Six H.S. rails (part) and stone railbed (item). (three steel ingots, three blaze powder, and three gold ingots in a Rolling Machine= eight H.S. rails.) (four stone ties in a crafting table= a stone railbed.)