What are the requirements of the two rails on the track?
Gauge requirements, linear standard gauge is 1435mm, curve can be properly widened.
At that level, the same section of line about two shares of the top surface of the rail height difference; line to line tolerance of 4mm, the other line is 6mm.
Curve outside rail should be set according to certain method (calculation formula) ultra high.
Two rail laying in should be appropriately tilted to the heart, that is to have rail bottom slope.
