Abstract: Concrete railroad crossties are mass-produced by slip-forming concrete using a specially adapted continuous casting machine to deposit concrete over a plurality of forms arranged side by side and end to end above an elongated casting bed. Each group of side-by-side casting forms is supported above the bed on a carriage longitudinally moveable on rollers, thereby permitting relative movement of adjacent end-to-end carriages to compensate for concrete contraction when pretensioned wire strands in the concrete are detensioned and for a slight recoil action when adjacent end-to-end crossties are separated by sawing. An apparatus for lifting side-by-side crossties in groups is equipped with hydraulic jacks for forcibly ejecting the concrete crossties from their forms.

Abstract: A system for mass producing prestressed concrete railroad ties using a slip-forming method of casting concrete over a plurality of molds arranged side by side and end to end on a casting bed; a specially equipped continuous casting machine for slip-forming the railroad ties in an upside-down orientation; techniques and equipment for separating and removing finished railroad ties from the casting bed; a plant layout to facilitate casting and handling operations; a specially adapted apparatus for rotating groups of railroad ties to permit stacking thereof in right-side-up orientation.

Abstract: A system for mass producing prestressed concrete railroad ties using a slip-forming method of casting concrete over a plurality of molds arranged side by side and end to end on a casting bed; a specially equipped continuous casting machine for slip-forming the railroad ties in an upside-down orientation; techniques an equipment for separating and removing finished railroad ties from the casting bed; a plant layout to facilitate casting and handling operations; a specially adapted apparatus for rotating groups of railroad ties to permit sticking thereof in rightside-up orientation.