A flow through railroad freight car may include a body having a containmentstructure. The body may be mounted upon railcar trucks for rolling motionalong railroad cartracks. The containment structure may include one or more hoppers, each ofwhich mayhave inflow and outflow ports, by which means lading may be introduced intothe car, ordischarged from it. The inflows may include an upper intake, which may be aseries ofhatches and hatch coamings. The hatch coamings may stand outwardly from thecontainmentstructure, and may also having internally extending skirts. In one instance,the skirts may beof a first length corresponding to a first fill level, or volume, for use withlading of a firstdensity. The length of the skirt may be adjusted at a later time to correspondto a second filllevel, or volume, for use with lading of a second density.
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