Abstract: A mobile apparatus for loading, transporting and laying an assembled track section comprises a self-propelled main vehicle comprising an elongated carrier frame, a pair of transversely aligned flanged wheels at each end thereof for engagement with, and support on, the rails of the assembled track section, a pair of lifting jacks at each carrier frame end associated with the flanged wheels, and a device for gripping the track section rails associated with each flanged wheel and associated lifting jack, the lifting jack being placeable on the track bed and operable to lift the carrier frame and flanged wheels with the assembled track section gripped by the rail gripping devices off the track bed, and an auxiliary self-propelled vehicle movable independently of the main vehicle and comprising a flatbed frame capable of receiving and supporting the carrier frame and flanged wheels of the main vehicle with the assembled track section gripped by the rail gripping devices, a track-bound undercarriage with flanged wh