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AtlasPostwarAARBoxcarUpgradeLarry KlineThis article describes modifications to an Atlas PostwarAAR boxcar to make it an accurate model of a specific prototypewhile improving some of the details. The Atlas boxcarwas first released in 1972. The prototype for the Atlas modelis the Pennsylvania RR X43c boxcar. This model, with somemodifications, is available again in the new Atlas O Trainmanline. The model has a diagonal panel roof, an R+3/4 ImprovedDreadnaught end, and an 8 foot Youngstown Steel Co. door.The R+3/4 end has one rectangular rib at the top, three morerolling pin shaped ribs in the top half, and four rolling pinshaped ribs in the bottom half.Ed Hawkins has compiled a roster for Postwar AAR boxcarswith R+3/4 ends. It should be noted that the R+3/4 ends on theAtlas model, and on the cars in the roster, were the early versionend used on cars built from 1948-1954. There was a laterversionR+3/4 that had the main corrugations with more taper.Altogether 47,425 boxcars were built with the early R+3/4 end.Only 4,485, or 14.35%, of the boxcars were built with 8 footdoors. The roster for cars with 8 foot doors includes the followinggroups:RDG 107000-107499 Superior doorsNJI&I 100-149 twelve panel welded sidesNJI&I 150-199 twelve panel welded sidesDT&I 14300-14549 straight sill between bolstersWAB 6000-6299 straight sill between bolstersPRR 70400-71899 X43cGN 21940-21949 straight sillPRR 86901-87650 X46, ovrhng diagonal panel roofWM 4201-4450 twelve panel welded sidesCP 55200-55524CP 55525-56024 Superior doors with ribsThe third column lists differences between the prototypecars and the Atlas model. The straight sills and Superior doorsare relatively easy modifications. The twelve panel weldedsides could be modeled by removing the rivet strips on theAtlas model and applying a styrene overlay to the sides. Theoverhanging diagonal panel roof on the PRR X46 could bemodeled by separating the Atlas roof from the carbody. All ofthe cars in the table had 7 rung ladders except for the PRR andCP cars which had 8 rung ladders.I am trying to include cars from the railroads that were thetop owners of boxcars in 1950 and cars from railroads thatare represented in early 1950s photos and movies of trains onthe Western Maryland. I decided to model the Wabash 6000-6299 series car because I had prototype photos and becauseI wanted one or two Wabash boxcars on my model railroad.These cars are very similar to the Atlas model. The main visibledifference is the side sill, which is straight between the bolstersrather than having tabs. Another difference, which is lessnoticeable, is that the Atlas model has narrower side panelsnext to the doors while the Wabash car has equal width sidepanels.Photos 1 and 2 show the 6000-6299 series cars that werebuilt by the Wabash in 1951. The specific built dates, courtesyof Chet French, are:6000 - 6065 3-516066 - 6128 4-516129 - 6194 5-516195 - 6257 6-516258 - 6290 7-516291 - 6299 8-51I started with a 1972 vintage undecorated Atlas kit. Thesekits are available on eBay and at O Scale meets. I removedthe side sill tabs and made straight side sills from Evergreen0.040” styrene strip. The roping staples at the ends of the sidesills were formed from wire. I removed the 8 rung ladders, caston hand grabs, and brake step and replaced them with partsfrom the Chooch Ultra Scale #610 Intermountain Box CarSuper Detail Kit. The Chooch ladders have 7 rungs which arecorrect for the Wabash 6000 series. I removed the Atlas runningboard, filled in the holes in the roof, and installed runningboard supports made from Evergreen 0.060” styrene angles ateach roof rib (Photo 3).I removed the corner steps and replaced them with stepsmade from Detail Associates 0.015 x 0.060 brass strip. I installedbrass running board supports from a Des Plaines Hobbies DPO34 • O Scale Trains - July/Aug ’09