scope:

This procedure applies to all pearlitic rails in plain line Switches & Crossings (S&C), adjustment switches, welds and weld repairs, as far as coupling conditions allow.

NOTE: Where coupling conditions are not possible see other approved procedures.

This procedure applies to the defect types:

a) horizontal defects;

b) tache ovales (internal transverse defect);

c) transverse defects (sub-surface);

d) transverse indications from wheelburns;

e) internal defects from MMA repairs;

f) suspect vertical longitudinal splitting (piping);

g) suspect hydrogen inclusions (shatter cracking);

h) defective head repair welds;

i) transverse indications from RCF discontinuities;

j) internal discontinuities from within aluminothermic welds (ATW); and

k) suspect transverse indications reported by the UTU's using 37° transducer.

This procedure also confirms 37° transverse indications reported by the UTUs.

Purpose

This procedure is applied when using the Roller Search Unit (RSU) Rail Testing System (RSU-RTS) for the detection of rail flaws, the conformation of UTU suspects including the detection of flaws detected by the 37° transducers.