Rick and company are out of the boxcar inside Terminus, the “sanctuary for all” which may or may not be filled with cannibals.
"You had boxcar loads of currency" moving across borders, says Michael Spencer, an economist who has written about this period.
Upon reaching the end of the line, Rob emptied his boxcar and placed 10 yellow pawns on the Dachau card.
In high numbers: boxcar odds (1950s+ Gambling)
A large cargo aircraft or bomber (WWII Army Air Forces)
[modifier sense from the high numbers seen on the sides of railroad boxcars]