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Frogs - Welded Boltless Manganese Frogs (WBM®)

voestalpine Railway Systems Nortrak WBM® Frogs are designed for Class I heavy haul service. By eliminating all rail joints the frog generates a continuous running surface that is not affected by CWR thermal stresses and reduces maintenance.

  • Uses Nortrak Hi-Solidity explosive depth hardened (EDH) manganese steel
  • Common footprint with RBM and WHM frogs
  • Reduced maintenance
  • Frog base cast to rail base profile to simplify plating
  • Elimination of bolted joints and rails
  • Uses bonded, bolted heel and toe blocks


TRADEMARK  1,739,175