Boxcars 100-102 are inspired by the SP prototype.

Boxcars 103 & 104 are inspired by equipment from the Pacific Coast Railroad which operated in Central California near San Lugs Obispo. The roof is corrugated steel.

Boxcar 105 is also inspired by equipment from the Pacific Coast Railroad. This was originally built for the Florence and Cripple Creek by American Car and Foundry.

Boxcar 106 is inspired by another style of car owned by the SP.