The Atlas HO Master ACF Pressureaide Centerflow Hopper Car ACFX 51553 (NKC 1993 Repaint) models the ACF Industries Pressureaide Center Flow covered hopper car manufactured by ACF Industries (Founded in 1899 as American Car and Foundry). Using the original Center Flow (No center sill to restrict product flow) platform, ACF enhanced the design by including a pressure differential to speed the unloading of dry bulk commodities. The Pressureaide covered hopper cars are still in production- ACF Industries' successor American Railcar Industries continues to manufacture these very popular cars to this day.
ACFX: "ACFX" are the reporting marks for the company formerly known as ACF Industries. Founded in 1899 as American Car and Foundry Company the new company was a consolidation of 13 US railcar manufacturers. All during the 20th Century American Car and Foundry continued to grow, taking the new name ACF Industries in 1954. Now known as American Railcar Industries (ARI), based in St. Charles, MO, the company continues to be one of North America's leading railcar manufacturers and lessors. This hopper car would be part of ACF Industries' huge leased car fleet. The "ACFX" reporting marks are still often seen on trains in North America.