Railway track geometry trolley

Railway track geometry trolley !

Absolute measurement and relative measurement.

#Absolutemeasurement: measuring and calculating the internal & external parameters of the railway tracks with reference to a fixed outside benchmark of the tracks. such as referring to the CPIII control network, GNSS satellite control network.

#relativemeasurement: Without consideration of the railway track line external positioning, just measure the internal parameters of the railway tracks, to ensure the smoothness of the railway lines.