Rail road hopper car fittings and method of operation

Abstract From the Canadian patent

A hopper car hopper may be wide at the top and narrow at the bottom. Movable doors control outflow. When in an open position or condition lading may be , discharged , through the discharge section of each hopper. Each discharge section has first and second , spaced apart side wall members that define opposed sides of the discharge. A through , center-sill car may have paired discharges on either side of the center sill. Each hopper has a , first door, movable to govern discharge of the associated hopper. The first door has a door , pan having first and second upturned side wings. The side wings being springloaded to , move in an interference fit against the first and second side wall …