AZL - 91937-2 - Covered Hopper, 3-Bay, PS-2 - Frisco - 81190

Model Information: Covered hoppers are designed for carrying dry bulk loads, varying from grain to products such as sand and clay. The cover protects the loads from the weather. Similar to an open hopper car, covered hoppers tend to contain 2, 3 or 4 separated bays. Each of these can be loaded and emptied individually, with access at the top to load the materials and visible chutes at the bottom for unloading.
Hoppers with 2, 3 or 4 bays are used for different purposes: 2 bay hoppers are used for the most dense loads (such as sand), while 4 bay hoppers are more suited to lighter loads. This is due to axle load limits, for example dry cement is very heavy in bulk quantities and a 4-bay hopper of sand would be very likely to exceed these limits while also having problems with increased strain upon the central span. By trading off cubic capacity 2 bay hoppers are able to transport these heavy loads. As technology has advanced, some of the heavier loads formerly assigned to 2-bay hoppers have been assigned to larger, more efficient 3-bay hoppers.

Prototype History: Like their PS-1 boxcars, PS-5 gondolas and other car designs, Pullman Standard applied the PS-2 classification to all of its covered hoppers. Pullman Standard built covered hoppers in many sizes and configurations. But say “PS-2” to railfans and it is this particular car that usually first comes to mind. The 2003 cubic foot car was one of the first, smallest and prolific of the PS-2 cars.

Pullman began building its standardized freight car designs with the PS-1 boxcar in 1947. Next up would be a standard covered hopper – hence PS-2 – shortly thereafter. Although covered hoppers are among the most common cars on the rails today, in 1947 they were a rarity. The PS-2’s primary competition wasn’t other covered hopper designs but boxcars. Grain, cement, sand and dried chemicals were carried mostly in boxcars prior to the 1950s either in sacks and bags or poured in bulk through hatches in the roof. The theory here was that it made more sense to utilize a single car for a variety of products. The car could carry bags of cement one way and then cut lumber the other. Of course a car that could do many things often couldn’t do many of them well.

Road Name History: The St. Louis - San Francisco Railway (reporting mark SLSF), also known as the Frisco, was a railroad that operated in the Midwest and South Central U.S. from 1876 to April 17, 1980. At the end of 1970 it operated 4,547 miles (7,318 km) of road on 6,574 miles (10,580 km) miles of track, not including subsidiaries Quanah, Acme and Pacific Railway or the Alabama, Tennessee and Northern Railroad; that year it reported 12,795 million ton-miles of revenue freight and no passengers. It was purchased and absorbed into the Burlington Northern Railroad in 1980.

The St. Louis - San Francisco Railway was incorporated in Missouri on September 7, 1876. It was formed from the Missouri Division and Central Division of the Atlantic and Pacific Railroad. This land grant line was one of two railroads (the other being the M-K-T) authorized to build across Indian Territory. The Atchison, Topeka and Santa Fe Railroad, ATSF, interested in the A & P right of way across the Mojave Desert to California, took the road over until the larger road went bankrupt in 1893; the receivers retained the western right of way but divested the ATSF of the St. Louis-San Francisco mileage on the great plains. After bankruptcy the Frisco emerged as the St. Louis and San Francisco Railroad, incorporated on June 29, 1896, which also went bankrupt. On August 24, 1916 the company was reorganized as the St. Louis - San Francisco Railway, though the line never went west of Texas, being more than 1,000 miles (1,600 km) from San Francisco.

From Wikipedia

Brand/Importer Information: AZL is the leader in North American Z scale locomotives and rolling stock. Since 2000, AZL has released a vast variety of freight, passenger and locomotives. AZL continues to push the boundaries of Z scale with amazing details and incredible performance. No matter if you are looking to run steam, or the most modern diesels, AZL has something for you.