Return to overview

Movable Frogs

The movable frogs has been developed in order to avoid the disadvantages of the rigid frogs, i.e. unsteadiness and lateral acceleration of the wheelset and high stress on material.

Movable Frogs

The movable frogs has been developed in order to avoid the disadvantages of the rigid frogs, i.e. unsteadiness and lateral acceleration of the wheelset and high stress on material. The advantage is that the running edge no longer is interrupted. The tip of the movable frog is fitted tightly in a sharp angle to the wing rail over a long distance. Thus, a long and even wheel passage is possible. This construction makes sure the conditions of guidance within the region of the frog are similar to those of the rails.

 

Advantages

  • Continuous wheel overrunning area (no running edges and head surface interruptions), therefore particularly suitable for high-speed and heavy haul traffic as well as for mixed operation (different vehicles and wheel set types)
  • No check rails required – a condition for high-speed traffic
  • Reduced airborne and structure-borne noise
  • Highest possible service life because there are no impacts in the wheel transition area
  • Can be thermite welded into the track
  • With special anti-creep equipment for transmission of longitudinal forces in the continuously welded track