Although covered hoppers had achieved widespread use by the 1950s, it wasn't until the following decade that they began to carry North America's grain harvest. Prior to the 1960s, U.S. and Canadian farmers sent their wheat and other grains to market in 40' box cars. The crop was packed in sacks or in cars with disposable grain doors that covered most of the door opening and turned the car into a rolling grain bin. Either way, loading and unloading was labor-intensive and time-consuming.
All that changed with American Car and Foundry's (ACF's) introduction of the Centerflowr covered hopper in 1961, followed the next year by Pullman-Standard's competitive PS-2CD covered hopper. Prior to the Centerflow, the typical covered hopper was little more than a coal hopper with a roof. Dry products such as salt were loaded through roof hatches and unloaded by gravity through doors in the floor. Like most freight cars of their era, these cars had a center sill. This support beam ran down the middle of the car between the left and right sets of unloading doors, and that led to problems in emptying the car. Typically some of the load would cake or "bridge" on the center sill, and the car would have to be vibrated to loosen the mess and achieve full unloading. Of course the vibration tended to shorten the life of the car.
The Centerflow's key innovation was the elimination of the center sill by relocating the car's main support beams to the bottom edge of each side. This enabled the discharge hopper doors to be located along the centerline of the car, allowing for easier, more complete unloading and banishing the problem of caking on the center sill. In addition, the car sides were curved to allow for more complete filling of the car. Stub center sills at each end provided a place to mount the trucks. The Centerflow was the first larger-capacity covered hopper designed for grain and products of similar density.
By the 1980s, ACF's Centerflow, along with covered grain hoppers from other builders, had spelled the end of the 40' box car in grain service. In addition to grain, Centerflows found work hauling a variety of other light to medium-density dry commodities, including salt, clay, chemicals, phosphates and other minerals.
The prototype for our Premier model, the 100-ton capacity, 4,650 cubic foot, three-bay Centerflow, was introduced in 1964. In all, over 100,000 Centerflows of various sizes have been built to date, and an upgraded version of the 4650 cu. ft. car remains in production today, as the 4650C model available from American Railcar Leasing.
MTH Premier O Scale freight cars are the perfect complement to any manufacturer's scale proportioned O Gauge locomotives. Whether you prefer to purchase cars separately or assemble a unit train, MTH Premier Rolling Stock has the cars for you in a variety of car types and paint schemes.
Virtually every sturdy car is offered in two car numbers which makes it even easier than ever to combine them into a mult-car consist. Many of MTH's Premier Rolling Stock offerings can also operate on the tightest O Gauge curves giving them even more added versatitlity to your layout.