CP Rail's 89'-4" Flat Cars Protofile 66
Railroad Model Craftsman 1994-01 pg. 103 Scale: HO Category: "Freight Cars - Flat Cars"
The author describes how he modeled this long car using two MDC No. 1280 undecorated 60-foot flat cars.
Modeling an Illinois Central Boxcar
Railroad Model Craftsman 2005-03 pg. 65 Scale: HO Category: "Freight Cars - Boxcars"
Building a replica of the IC's 11280 boxcar. Mostly text, not many step-by-step photos.
Protofile: Modeling a U.S. Leasing Airslide Covered Hopper part 62
Railroad Model Craftsman 1991-10 pg. 71 Scale: HO Category: "Freight Cars - Hoppers"
This article covers the Rock Island covered hopper, and the author shows how he modeled one starting with a Eastern Car Works Airslide covered hopper kit. Includes model and prototype photos, as well as one drawing.