Refrigerated boxcar ducted floor

1. A refrigerated railcar comprising a pair of side walls, a roof, a floor, and a refrigeration unit, the floor comprising:

a bottom structure comprising a plurality of channels for return air flow from an interior of the railcar to the refrigeration unit; and

at least two top plates coupled to the bottom structure, wherein each of the top plates extends longitudinally along the bottom structure and is configured to rotate up and away from the bottom structure proximate one of the side walls of the pair of side walls;

wherein the at least two top plates are pivotally coupled to the bottom structure via one or more pivot rods coupled to a longitudinal edge of the bottom structure proximate one of the side walls of the pair of side walls, wherein lifting an edge of a top plate opposite the edge of the top plate pivotally coupled to the bottom structure causes the top plate to rotate to an upright position exposing the plurality of channels of the bottom structure.

2. The railcar of claim 1 , wherein the at least two top plates are coupled to the bottom structure via one or more mechanical quick disconnect fasteners.

3. The railcar of claim 1 , wherein the at least two top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure.

4. The railcar of claim 1 , wherein the at least two top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure.

5. The railcar of claim 1 , wherein the at least two top plates comprise openings that, when oriented in a first position the openings are above the plurality of channels for return air flow and permit return air to flow through the top plates into the plurality of channels of the bottom structure, and when oriented in a second position the openings are not above the plurality of channels for return air flow and prevent return air from flowing through the top plates into the plurality of channels of the bottom structure.

6. The railcar of claim 1 , further comprising a return air gutter extending longitudinally between the bottom structure and one of the side walls of the railcar; and wherein:

when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure, a width of the top plates extends transversely to obstruct a larger portion of the return air gutter than when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure.

7. The railcar of claim 1 , further comprising a return air gutter extending longitudinally between the bottom structure and one of the side walls of the railcar; and wherein:

when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure, a width of the top plates extends laterally to obstruct a smaller portion of the return air gutter than when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure.

8. The railcar of claim 1 , further comprising a return air space extending laterally between the bottom structure and an end of the railcar; and wherein:

when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure, a length of the top plates extends longitudinally to obstruct a larger portion of the return air space than when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure.

9. The railcar of claim 1 , further comprising a return air space extending laterally between the bottom structure and an end of the railcar; and wherein:

when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure, a length of the top plates extends longitudinally to obstruct a smaller portion of the return air space than when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure.

10. A floor for a refrigerated container comprising a pair of side walls, a roof, the floor, and a refrigeration unit, the floor comprising:

a bottom structure comprising a plurality of channels for return air flow from an interior of the container to the refrigeration unit; and

at least two top plates coupled to the bottom structure, wherein each of the top plates extends longitudinally along the bottom structure and is configured to rotate up and away from the bottom structure proximate one of the side walls of the pair of side walls;

wherein the at least two top plates are pivotally coupled to the bottom structure via one or more pivot rods coupled to a longitudinal edge of the bottom structure proximate one of the side walls of the pair of side walls, wherein lifting an edge of a top plate opposite the edge of the top plate pivotally coupled to the bottom structure causes the top plate to rotate to an upright position exposing the plurality of channels of the bottom structure.

11. The floor of claim 10 , wherein the at least two top plates are coupled to the bottom structure via one or more mechanical quick disconnect fasteners.

12. The floor of claim 10 , wherein the at least two top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure.

13. The floor of claim 10 , wherein the at least two top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure.

14. The floor of claim 10 , wherein the at least two top plates comprise openings that, when oriented in a first position the openings are above the plurality of channels for return air flow and permit return air to flow through the top plates into the plurality of channels of the bottom structure, and when oriented in a second position the openings are not above the plurality of channels for return air flow and prevent return air from flowing through the top plates into the plurality of channels of the bottom structure.

15. The floor of claim 10 , further comprising a return air gutter extending longitudinally between the bottom structure and one of the side walls of the container; and wherein:

when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure, a width of the top plates extends transversely to obstruct a larger portion of the return air gutter than when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure; and

when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure, a width of the top plates extends laterally to obstruct a smaller portion of the return air gutter than when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure.

16. The floor of claim 10 , further comprising a return air space extending laterally between the bottom structure and an end of the container; and wherein:

when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure, a length of the top plates extends longitudinally to obstruct a larger portion of the return air space than when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure; and

when the top plates prevent return air from flowing through the top plates into the plurality of channels of the bottom structure, a length of the top plates extends longitudinally to obstruct a smaller portion of the return air space than when the top plates comprise openings that permit return air to flow through the top plates into the plurality of channels of the bottom structure.

17. A method for use with a refrigerated railcar, the refrigerated railcar comprising a pair of side walls, a roof, a floor, and a refrigeration unit, the floor comprising: a bottom structure comprising a plurality of channels for return air flow from an interior of the railcar to the refrigeration unit, and a top plate pivotally coupled to the bottom structure via a pivot rod, wherein the top plate extends longitudinally along the bottom structure and is pivotally coupled to the bottom structure proximate one of the side walls of the pair of side walls, the method comprising:

disconnecting one or more quick disconnect fasteners coupling the top plate to the bottom structure;

lifting an edge of the top plate opposite the edge of the top plate pivotally coupled to the bottom structure;

engaging the edge of the top plate pivotally coupled to the bottom structure with the pivot rod; and

rotating the top plate to an upright position exposing the plurality of channels of the bottom structure.

18. The method of claim 17 , further comprising resting the top plate against one of the side walls.