Wheel & wheelset equipment
Wheel and wheelset maintenance equipment covers the machine tools and measurement systems used to reprofile, inspect, and certify railway wheelsets during their operational life.
The primary workshop tool for wheel maintenance is the underfloor wheel lathe, a pit-mounted CNC machine that reprofiles both wheels of an axle without removing the wheelset from the vehicle.
The train is driven onto the lathe and positioned over the cutting heads; friction rollers grip each wheel tread and rotate the wheelset against fixed tooling. Computer-controlled measurement heads scan the wheel profile before cutting, and the lathe removes material precisely to restore the target geometry.
Underfloor lathes are configured in tandem variants that machine two wheelsets simultaneously, reducing the time a vehicle occupies the maintenance track. Single-axle cycle times for a standard preventive reprofiling — where material removal is small — can be completed in 30–60 minutes per axle pair on tandem machines.
The operational standard governing what condition triggers reprofiling is EN 15313, which defines dimensional limits for flange thickness, flange height, wheel diameter difference within an axle, and surface defect tolerances.
Reprofiling continues until the wheel diameter approaches the minimum limit set in the maintenance plan; at that point the wheel is scrapped and replaced.
Measurement and inspection
Automated optical or laser measurement systems scan wheelset geometry at depot entry points, replacing manual gauge checks for routine screening.
Trackside wayside detectors — separate from workshop equipment — can flag individual wheelsets with defects as trains pass at line speed, generating workshop referrals before the scheduled maintenance interval.
Ultrasonic testing of axles is conducted at defined intervals to detect internal fatigue cracking. Axle ultrasonic inspection equipment ranges from portable handheld units for field use to fixed installation systems integrated into the wheelset press for off-vehicle inspection.
Standards
EN 15313 governs in-service wheelset limits and maintenance operations. EN 13262 specifies product requirements for new wheels. EN 13260 covers assembled wheelset requirements. UIC Leaflet 510-2 provides supplementary guidance on wheel profile limits and service conditions used alongside the European standards.