The design of a complete arm prosthesis.

A method and machine are disclosed for dispensing railroad ties, particularly concrete railroad ties, along a prepared roadbed surface for a moving vehicle. The tie laying machine is connected to a trailer carrying the ties. The ties are conveyed from the trailer to the input end of the tie laying machine as needed. The tie laying machine includes a forward carriage shiftable transverse to the direction of travel of the vehicle along the roadbed. The vehicle also includes sensing means sensing an alignment line and control and power means operatively connected to the sensing means to shift the carriage to align the ties held by the machine relative to the alignment line prior to discharge. In operation the carriage shifts to a center location to receive a tie from the infeed conveyor of the machine and then, after receipt of the tie, shifts to an alignment position relative to the alignment line. The tie is then released into a discharge assembly where it is discharged on the prepared roadbed surface at a predetermined spaced interval from the preceding tie.