The M-K-T Katy Box Car No. 6464-515 was painted in pastel YELLOW for Set No. 1587S that is known as the "Girls Set" in 1957 and 1958. The Multi-block doors are painted pastel BLUE and the CHARCOAL BROWN lettering was heat-stamped on a Type IIB body with bar-end trucks that have tabbed couplers.

Note that the car is numbered "6464515" on the left of this car, and that it is identical to the No. 6464-350 except for the colors and the number.

This, and the New York Central No. 6464-510 box car are the only cars in the 6464 series that were never offered for separate sale. Today, this car today is highly prised by collectors. There are no variations.