Callisto track geometry measurement systems incorporate an inertial measurement unit (IMU), a laser/camera based gage reference system, and GPS within a rugged, compact package to accurately locate and measure the geometry of the track. Typical geometry channels are recorded based on the application and can include: gauge, alignment, curvature, surface, cross-level, super-elevation, warp and twist. For inspection applications, track geometry channels are processed to produce exceptions in real-time.