Railroads. a completely enclosed freight car.
boxcars, a pair of sixes on the first throw of the dice in the game of craps.
Informal. extremely or disproportionately large:
The business had boxcar profits during its first year.
Historical Examples

Blue Ridge Country Jean Thomas
Andersonville, Volume 4 John McElroy
The Delta of the Triple Elevens William Elmer Bachman
Bunny Brown and His Sister Sue in the Sunny South Laura Lee Hope
Ticktock and Jim Keith Robertson

(US & Canadian) a closed railway freight van

A throw of two sixes (1900s+ Crapshooting)
Very large shoes (1940s+)


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