Wheel and wheelset maintenance equipment covers the machine tools and measurement systems used to reprofile, inspect, and certify railway wheelsets during their operational life.
Wheel wear is continuous, which makes wheelset work the most cyclical discipline within maintenance and workshop equipment. Every wheel has a finite number of reprofiling cycles before it must be replaced.
Reprofiling and the wheel lathe
The primary workshop tool is the underfloor wheel lathe — a pit-mounted computer numerical control (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.
Tandem variants machine two wheelsets simultaneously, reducing the time a vehicle occupies the maintenance track. Cycle time for a standard preventive reprofiling, where material removal is small, is well below that of a full heavy overhaul.
EN 15313 defines what triggers reprofiling: dimensional limits for flange thickness, flange height, wheel diameter difference within an axle, and surface defect tolerances. Cutting continues over the wheel’s life until the diameter approaches the minimum 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. Wayside detectors — separate from workshop equipment — flag defective wheelsets as trains pass at line speed, generating workshop referrals ahead of the scheduled maintenance interval.
Ultrasonic testing of axles detects internal fatigue cracking at defined intervals. Equipment ranges from portable handheld units for field use to fixed installations 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, and EN 13260 covers assembled wheelset requirements.
International Union of Railways (UIC) Leaflet 510-2 provides supplementary guidance on wheel profile limits and service conditions, used alongside the European standards.