I have an HO gauge working hopper car. It is about 50 years old, but in perfect condition. Our model train group is making a new layout and I would like to have this hopper drop the coal from the working metal doors. Problem is that I do not have the trip mechanism that opens up the doors. I believe the car was made by Tyco-Mantua, the bottom frame is all metal and rolls beautifully on the track. Does anybody out there know where I could get the mechanism or make one. I really do not know what it looks like. My dad and I used this on our layout in the 1960's. I know it will work if I can get help with the trip mechanism that attaches to the track. Any help would be greatly appreciated. Albie44 from Barnegat, NJ