The K-Line Gunderson Well Car was a single 40' well that is for a MAXI-STACK 5-unit articulated car. They labeled it like a Husky-Stack car with a 48' well, even though the longest container it can carry in the well is a 40' container.
Bachmann can produce a MAXI-STACK, 40' well, 5-unit, articulated car if they connected these wells like the Thrall Car well cars.
Andrew