Abstract: An impact detection device for a system for locking the kingpin of a semitrailer on a railway unit includes a rigid connecting piece connected to a kingpin receiving structure and a connecting shaft connecting the rigid connecting piece to the railway unit, mounted on the railway unit, received with the ability to pivot in an oblong provided in the rigid connecting piece and capable of moving in the oblong. The device also includes a shear pin that prevents the connecting shaft from moving in the oblong and which breaks in the event of an impact so as to allow the connecting shaft to move in the oblong, a bypass pipe mounted as a bypass on the general pipe of the railway unit, and a cutoff tool secured to the railway unit, which cuts off the bypass pipe when the shear pin is broken and a connecting shaft is moving in the oblong.

Abstract: An impact detection device for a system for locking the kingpin of a semitrailer on a railway unit includes a rigid connecting piece connected to a kingpin receiving structure and a connecting shaft connecting the rigid connecting piece to the railway unit, mounted on the railway unit, received with the ability to pivot in an oblong provided in the rigid connecting piece and capable of moving in the oblong. The device also includes a shear pin that prevents the connecting shaft from moving in the oblong and which breaks in the event of an impact so as to allow the connecting shaft to move in the oblong, a bypass pipe mounted as a bypass on the general pipe of the railway unit, and a cutoff tool secured to the railway unit, which cuts off the bypass pipe when the shear pin is broken and a connecting shaft is moving in the oblong.