Clyde,
The blackstone website explains the 3000 series boxcar rebuilds:
Quote
http://blackstonemodels.com/rolling/box/boxcars.php
By 1924, over two decades of heavy service was evident as the 3000 series fleet begged for replacement or repair. Now re-named as the Denver and Rio Grande Western Railroad, the company accountants found tax burden relief by rebuilding the existing boxcars over the option of placing an order for new cars. The “rebuilding” of the cars has been lightheartedly described as ‘jacking up the road number and replacing everything underneath’. In actuality, the cars were stripped of much of the wood while the hardware and trucks were re-used to construct relatively new cars. As rebuilt, the boxcars were equipped with sheet metal Murphy roofs while the side and end doors on many were upgraded with Camel hardware. This period marked the only extensive rebuild of this car series and from this point much of the 3000 series fleet continued to serve the D&RGW up to the end of mainline operations in 1968.
Unfortunately, I don't know anything about the brake gear, but I can see if Mr. Slone included any information in his "Century +10" book when I get home (10 more days)
Someday, you'll have to explain your "deerslayer" nickname.
Greg
Greg Coit
Bayfield, CO