The C&S started building its own narrow gauge coal cars in 1902. The cars closely copied St. Charles rolling stock with truss rods and archbar trucks but had solid one-piece corner braces and lacked end stakes and some stake pockets. They also had four 10 inch high side boards instead of three boards as on the St. Charles versions. The 162 new Phase 1 coal cars carried numbers 4246 through 4407.

In 1907 and 1908, the C&S built the Phase 2 series, numbers 4408 through 4497. They had nine inch side sills. Above the side sills they were identical to the 1902 series except for two details: The side stakes were straight instead of tapered. Phase 2 cars also employed inside vertical strap metal supports, a feature the C&S shops apparently omitted from Phase 1 cars. The side view shows the locations of the vertical braces as tabs on the outside of the car, adjacent to the stakes; they also appear in the section view.

The big differences between Phase 2 and other C&S coal cars occurred below the side sills. The cars had wood underframes and truss rods but Bettendorf trucks and bolsters replaced the archbar trucks. A chain roller-hanger casting also appeared on those cars. It kept the chain linking the brake rod and brake staff from fouling the trucks.

The C&S built the Phase 3 cars in 1910, numbers 4498 through 4547. They had Bettendorf trucks and steel underframes. The resulting modifications made them considerably different from earlier cars.

The only surviving C&S coal car is number 4319, a Phase 1 version. It is on display at Black Hawk, Colorado. No Phase 2 car exists. Original C&S erecting cards appear in Robert Grandt's Narrow Gauge Pictorial, Volume VIII.