The multichannel GPR complex was designed for monitoring the state of the ballast section and upper layer of the natural bed. APPLICATION: Determination of the railway embankment width and structure content; Allocation of subsidence in the ballast and natural bed layers; Determination of the natural bed; Mapping underground pipessing railway embankment; Control of conformation of railway embankment structure to the project documentation. FEATURES: high speed multi-channel control unit; of channels: up to six (up to 6 profiles simultaneously); antennas frequency: from 150MHz up to 2500MHz; maximum survey speed: up to 120 km/h; detection depth: up to 8m; creating 3D model of ballast; GPS integration; automatic data processing.