Flow through rail road freight car

1. A flow through railroad freight car comprising:

a containment shell carried by railroad car trucks for travel along railroad tracks;

said containment shell defining an enclosed chamber;

at least one outflow mounted to a lower region of said containment shell;

at least one inflow mounted to an upper region of said containment shell;

said inflow including a coaming;

said coaming standing proud of said containment shell a first distance;

said coaming including a depending skirt terminating at a lip;

said depending skirt extending inwardly of said containment shell into said chamber a second distance to said lip;

said skirt permitting lading introduced through said inflow to flow therepast into said containment shell;

said skirt inhibiting filling of said containment shell upwardly of said lip; and

said second distance being at least one half as great as said first distance; and

said skirt is at least one of (a) of variable length; and (b) removable.

2. The flow through railroad freight car of claim 1 wherein said second distance is at least three quarters as long as said first distance.

3. The flow through railroad freight car of claim 1 wherein said containment shell has a volumetric capacity, said skirt has a lower margin, and when said railroad freight car is on flat track, a portion of said volumetric capacity of said railroad freight car lies at a higher level than said lower margin of said skirt, and said portion of said volumetric capacity is at least 2% of said volumetric capacity.

4. The flow through railroad freight car of claim 3 wherein said portion of said volumetric capacity is at least 5% thereof.

5. The flow through railroad freight car of claim 1 wherein said containment shell has an internal coating, said coating being a protective coating.

6. The flow through rail road freight car of claim 1 wherein said containment shell has a volumetric capacity in excess of 4500 cu. ft.

7. The flow through railroad freight car of claim 1 wherein said containment shell includes at least two sub-compartments, each of said sub-compartments having a separate outflow.

8. The flow through railroad freight car of claim 1 wherein said containment shell falls within AAR Plate C.

9. The flow through railroad freight car of claim 1 wherein said containment shell includes laterally outwardly bulging side sheets.

10. The flow through railroad freight car of claim 1 wherein said depending skirt includes an array of slots to permit adjustment of said skirt.

11. A flow through railroad freight car comprising:

a containment shell carried by railroad car trucks for travel along railroad tracks;

said containment shell defining an enclosed chamber;

at least one outflow mounted to a lower region of said containment shell;

at least one inflow mounted to an upper region of said containment shell;

said inflow including a coaming;

said coaming standing proud of said containment shell a first distance;

said coaming including a depending skirt terminating at a lip;

said depending skirt extending inwardly of said containment shell into said chamber a second distance to said lip;

said skirt permitting lading introduced through said inflow to flow therepast into said containment shell

said skirt inhibiting filling of said containment shell upwardly thereof about said skirt;

and

said second distance being at least one half as great as said first distance;

side sills, and top chords spaced upwardly from said side sills;

said containment shell includes side sheets extending between said side sills and top chords, said side sheets having an uppermost margin; and

said skirt has a lowermost margin extending to a level lower than said uppermost margin of said side sheets.

12. The flow through railroad freight car of claim 11 wherein said skirt is of variable length.

13. The flow through railroad freight car of claim 11 wherein said skirt is removable.

14. The flow through railroad freight car of claim 11 wherein said depending skirt is made of a substantially inert material.

15. The flow through railroad freight car of claim 14 wherein said inert material is one of (a) stainless steel; (b) aluminum; (c) a plastic; and (d) a metal member having a protective surface coating.

16. A flow through railroad car comprising:

a railcar body having a pair of end sections, each end section being mounted over a railcar truck;

a pair of spaced apart side sills, said side sills running between said end sections;

a pair of spaced apart top chord members;

sidewalls extending upwardly between said side sills and said top chords, said sidewalls having an outwardly bulging curvature between said side sills and said top chords;

said sidewalls including side sheets, said side sheets having an uppermost margin;

end bulkheads extending between said sidewalls;

a hopper array including at least two sub-chambers, each sub-chamber having a pair of sloped side sheets and a pair of sloped end sheets, said sloped side sheets and sloped end sheets co-operating to form a rectangular outflow, said outflow having a gate valve mounted thereacross,

said sloped side sheets having upward margins meeting said sidewalls;

arcuately formed roof sheets extending between said sidewalls over said hopper array;

an array of inflow ports formed in said roof sheets, said inflow ports having upstanding coamings, and hatches mounted to said coamings, said hatches being operable to allow admission of lading into said hopper array;

said hopper array, sloped sheets, sidewalls and roof sheets cooperatively defining a containment shell having at least one enclosed chamber;

said coamings having internally depending skirts intruding into said containment shell, each skirt terminating at a lip; and

said skirts protruding inwardly of said roof sheets a distance greater than 3 inches to said respective lips, said containment shell having a volume, a portion of that volume being located upwardly of said lip, said skirts inhibiting filling of that portion of the volume upwardly of said lip; and

at least one of said skirts protruding at least ⅓ as far into said enclosed chamber as its respective coaming stands upwardly of said roof sheets and said at least one of said skirts having a lower margin terminating at said lip that is lower than said uppermost margin of said side sheets.

17. A process of adjusting the volumetric fill capacity of a flow through rail road car, said process comprising the steps of:

providing a flow through railroad freight car having:

a containment shell carried by railroad car trucks for travel along railroad tracks;

said containment shell defining an enclosed chamber;

at least one outflow mounted to a lower region of said containment shell;

at least one inflow mounted to an upper region of said containment shell;

said inflow including a coaming;

said coaming standing proud of said containment shell a first distance;

said coaming including a depending skirt, said depending skirt terminating at a lip;

said depending skirt extending inwardly of said containment shell into said chamber a second distance to said lip; and

changing said second distance by undertaking a step chosen from the set of steps consisting of:

(a) adding a further portion to said skirt, said further portion being of a length great enough that said second distance, as changed, exceeds one third of said first distance;

(b) removing a portion from said skirt to reduce said second distance, said second distance having been greater than one third of said first distance before removing said portion;

(c) removing said skirt and replacing said skirt with another skirt of different length; and

(d) mounting another skirt co-axially with said depending skirt, said other skirt being positioned to have a lower margin protruding below said depending skirt.

18. The process of claim 17 wherein said process includes adding a further portion to said skirt, and said step of adding includes welding said additional portion in place.

19. The process of claim 17 wherein said process includes coating said skirt with a protective coating after changing said second distance.

20. The process of claim 17 wherein said process includes the step of replacing a lining of said flow through railroad freight car contemporaneously with changing said distance.

21. The process of claim 17 wherein said process includes the step of determining a volumetric full condition according to a designated lading density, providing a volumetric capacity schedule, and adjusting said skirt length according to said schedule to match said density.

22. The process of claim 17 wherein said skirt and said coaming have co-operating fittings, said fittings including slots, and said skirt being movable, and said process includes the step of adjusting the positioning of the co-operating fittings to adjust said second distance.

23. A flow through railroad freight car comprising:

a containment shell carried by railroad car trucks for travel along railroad tracks;

said containment shell defining an enclosed chamber, said containment shell having a volumetric capacity;

at least one outflow mounted to a lower region of said containment shell;

at least one inflow mounted to an upper region of said containment shell;

said inflow including a coaming;

said coaming including a depending skirt;

said depending skirt extending inwardly of said containment shell into said chamber;

said skirt has a lower margin terminating at a lip lying inwardly of said container shell, and when said railroad freight car is on flat track, a portion of said volumetric capacity of said railroad car lies at a higher level than said lip of said lower margin of said skiff, said lip inhibiting filling of said portion of said volumetric capacity, and said portion of said volumetric capacity is at least 2% of said volumetric capacity.

24. The flow through railroad freight car of claim 23 wherein said portion of said volumetric capacity lies in the range of 2 to 30% of said volumetric capacity.

25. The flow through railroad freight car of claim 23 wherein said portion of said volumetric capacity lies in the range of 10 to 20% of said volumetric capacity.

26. A flow through railroad freight car comprising:

a containment shell carried by railroad car trucks for travel along railroad tracks;

said railroad freight car having a coupler centerline height;

said containment shell defining an enclosed chamber, said containment shell having a volumetric capacity;

at least one outflow mounted to a lower region of said containment shell;

at least one inflow mounted to an upper region of said containment shell;

said shell including a roof panel having a roof panel profile having an apex;

said inflow including a coaming;

said coaming including a depending skirt terminating at a lip, said skirt inhibiting filling of said containment shell thereabout upwardly of said lip;

said depending skirt extending inwardly of said containment shell into said chamber;

said skirt has a lower margin at said lip defining an inflow height limit; a first vertical distance is defined between said coupler centerline height and said apex;

a second distance is defined between said inflow height limit of said lip of said lower margin of said skirt and said apex; and

said second distance is in the range of 5-20% of said first distance.

27. The flow through railroad freight car of claim 26 wherein said second distance is about 10-15% of said first distance.

28. The flow through railroad freight car of claim 26 wherein:

said railroad car includes first and second side sills, first and second top chords and first and second arcuately outwardly bulging side sheets extending between said side sills and top chords respectively, said side sheets having an upper marginal edge;

said roof panel includes an arcuately concave roof sheet; and

said skirt has a lower margin terminating at a level lower than said upper marginal edge.