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If you go to http://www.railpictures.net and work through their system you will find pics of both conventional hoppers and MoW (Maintenance of Way) hoppers. You will see that the conventional hopper bays drop between the rails through gates that are basically open or shut... so the load stays in or drops out. MoW hoppers mostly drop ballast outside the rails (a few such as Hart cars also drop between the rails)... the gates from the bays on these cars are built so that the way they are opened can be regulated to allow a fine trickle of stone/ballast or a heavier drop as required. In the UK our MoW hoppers more often drop between the rails or between and outside... so I too would like to knowhow the work crews get the ballast into the 4foot way (between the rails). Bear in mind that when ballast is being replaced rather than topped up the old material has to be taken out first... this could be put into conventional hoppers cascaded into MoW service to be taken and dumped in a heap... from a trestle or similar arrangement. Hope this helps.
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