
1) Flat 2) Flatbed 3) Freight bearer 4) Freight car 5) Freight carrier 6) Freight rolling stock 7) Freight train unit 8) It has no sides or roof 9) One that rides the rails 10) Part of a freight train 11) Part of a train, often 12) Piggybacking spot 13) Rail carrier 14) Roller without sides 15) Rolling freight transporter
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https://www.crosswordclues.com/clue/flatcar

1) Flatbed
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https://www.crosswordclues.com/clue/flatcar

A flatcar (US) (also flat car (US) or flat wagon (UIC)) is a piece of railroad (US) or railway (non-US) rolling stock that consists of an open, flat deck on four or six wheels or a pair of trucks (US) or bogies (UK). The deck of the car can be wood or steel, and the sides of the deck can include pockets for stakes or tie-down points to secure load...
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http://en.wikipedia.org/wiki/Flatcar

(from the article `freight car`) ...to convey fresh or frozen foods over long distances. Another variation of the common boxcar is the stock car with slatted sides, which is used to ... Before World War II, freight cars consisted almost entirely of four basic types: the semiwalled open car, the fully covered boxcar, the flatcar, and ......
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http://www.britannica.com/eb/a-z/f/35

A type of rolling stock, which can be a flat-bottomed car with no sides on which freight (including intramodal shipping containers) can be stacked. A bulkhead is a flatcar with walls on the front and rear. A center-beam bulkhead is a bulkhead flatcar with an additional wall dividing one side of the flatcar from the other, but still without any side...
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http://www.translationdirectory.com/glossaries/glossary256.php

[
n] - freight car without permanent sides or roof
Found on
http://www.webdictionary.co.uk/definition.php?query=flatcar
noun freight car without permanent sides or roof
Found on
https://www.encyclo.co.uk/local/20974

a railroad car consisting of a platform without sides or top.
Found on
https://www.infoplease.com/dictionary/flatcar
No exact match found.