ACF Center Flow demonstrator covered hopper

ACFX 88 was a 3-bay 3500 cubic foot capacity demonstrator for American Car & Foundry's "Center Flow" covered hopper concept. It spent most of its demonstrator life on the ATSF in the 1960s, and I believe it eventually made its way into the regular lease fleet after it was no longer needed as a demonstrator. My L-Gauge 1:48 scale model uses the new 4x1x1&2/3 slope piece to achieve the cylindrical look. Hoping to build a couple more of these cars once part 3573 becomes more widely available in...