Yamanaka Group

Business Fields

Anti-Friction Tongue Rail

As a key component of turnouts, tongue rails can become easily worn down and require frequent replacement.
We have developed an anti-friction tongue rail with improved abrasion resistance,which can help reduce maintenance costs.

Features of Anti-Friction Tongue Rail

The anti-friction tongue rail uses heat-treatable HH340 materials for the rails. The tips have been shaped to control the initial flaw and abrasion.
These features provide improved abrasion resistance compared to existing slack-quench (SQ) heat-treated tongue rails. This extends the tongue rails’ usable life, and can help to reduce track maintenance costs.

  • Hardness Key

Improved Quenching Properties

Switching the materials from HC to HH340 has made the rail surface hard while keeping the inside tough.
The anti-friction tongue rail technology has been developed by the Railway Technical Research Institute. Kanto Bunkiki is manufacturing and selling this anti-friction tongue rail under the technical guidance of the Railway Technical Research Institute.

Limiting the Initial Abrasion

The tongue rail tip cross-sectional shape has been shaved and corrected in alignment with the angles of the train wheels as they run along the track.

Some of the angles are 65° and 70°.

  • The shape of an ordinary tongue rail tip is shaved and corrected in alignment with the angles of the train wheels

Accuracy Test

The anti-friction tongue rail meets all the standard values and performance requirements of the JIS E1101 materials tests.