Although documentation is installed locally with our software, we provide the latest version online also for the convenience of our users.

The current version of CONTACT is version 25.1, released April 15th, 2025.

• User guide for CONTACT, Rolling and sliding contact with friction. Technical report TR 20-01 (v25.1), Vtech CMCC, 2025.

This version provides the following extensions with respect to earlier versions of the program:

• Complete integration in Simpack Rail.
• Automatic and detailed analysis of wheel/rail contacts, using planar and conformal contact approaches, including non-steady (transient) contact analysis.
• Providing a `fast track‘, to skip the full calculation in less demanding situations, including the new Modified FaStrip approach.
• Support for switches and crossings and wheel out-of-roundness, with rail and wheel profiles varying in running direction.
• Ability to compute plastic shear of interfacial layers, compute surface temperatures, and temperature-dependent friction.
• Various smaller extensions and updates to improve robustness of the calculations.

More information is provided in the release notes for v25.1, v24.1, and v23.1.