Bachmann - UNKNOWN - Tank Car, 3-Dome, ACF - Canadian National - 211637

Model Information: The model was first made by Bachmann in the late 1960s. The early versions were also sold using their Parkways Industries label. It was eventually retired and replaced by a completely new tooling in 2012. The new tooling is different enough, that it is listed as a different series.

Prototype History: Triple Dome tank cars, while not as common as single-domes, are a railroad staple. They have been around since the first half of the 20th century.

The dome above tank cars serves as an expansion chamber as temperature affects the volume of any liquids contained within. With no dome, if the liquid did not 100% fill the tank, then it is possible for the liquid to slosh around inside the tank, causing instability and increasing the possibility of a derailment. The dome allows the tank to be slightly overfilled so that should the volume in the main section decrease due to colder temperatures or even a small leak, that there will still be sufficient liquid within to prevent sloshing. Similarly if temperature increases, the liquid can rise up inside the dome preventing excess pressure within the tank. While not as serious as an underfilled tank, an over-pressurized tank might present problems during unloading.

If you see three domes on a tank car it is because there are three separate compartments inside the tank car each containing a different liquid. This was desirable for many reasons.

Often times a delivery would consist of much less than a carload (LCL) of liquid. Remember the sloshing problem? So if you only had to fill a third of a tank with your commodity, then you can avoid the issue by using one of the three chambers within the tank car. Also, you might have several grades of a commodity to deliver such as unleaded, leaded and diesel fuel and you need them to be kept separate. Or you might be producing wine and you want your white wine kept separate from your red wine. Or maybe all three chambers had the same contents but were being delivered to three different customers. It can be very difficult to determine when one third of a single dome tank car has been discharged...

For all these reasons, three-dome tank cars were a common sight in the first half of the 20th century. However, with the rise of the interstate highway system and the modern trucking industry, LCL deliveries have primarily been accomplished with tanker trucks instead of tank cars and the three-dome tank car has gradually disappeared from the North American rail network.

Road Name History: The Canadian National Railway Company (reporting mark CN) is a Canadian Class I railway headquartered in Montreal, Quebec that serves Canada and the Midwestern and Southern United States. CN's slogan is "North America's Railroad". CN is a public company with 24,000 employees. It had a market capitalization of 32 billion CAD in 2011. CN was government-owned, having been a Canadian Crown corporation from its founding to its privatization in 1995. Bill Gates was, in 2011, the largest single shareholder of CN stock.

CN is the largest railway in Canada, in terms of both revenue and the physical size of its rail network, and is currently Canada's only transcontinental railway company, spanning Canada from the Atlantic coast in Nova Scotia to the Pacific coast in British Columbia. Its range once reached across the island of Newfoundland until 1988, when the Newfoundland Railway was abandoned.

Following CN's purchase of Illinois Central (IC) and a number of smaller US railways, it also has extensive trackage in the central United States along the Mississippi River valley from the Great Lakes to the Gulf of Mexico. Today, CN owns about 20,400 route miles (32,831 km) of track in 8 provinces (the only two not served by CN are Newfoundland & Labrador and Prince Edward Island), as well as a 70-mile (113 km) stretch of track (see Mackenzie Northern Railway) into the Northwest Territories to Hay River on the southern shore of Great Slave Lake; it is the northernmost rail line anywhere within the North American Rail Network, as far north as Anchorage, Alaska (although the Alaska Railroad goes further north than this, it is isolated from the rest of the rail network).

The railway was referred to as the Canadian National Railways (CNR) between 1918 and 1960, and as Canadian National/Canadien National (CN) from 1960 to the present.

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Brand/Importer Information: Bachmann Industries (Bachmann Brothers, Inc.) is a Bermuda registered Chinese owned company, globally headquartered in Hong Kong; specializing in model railroading.

Founded in Philadelphia, Pennsylvania, the home of its North American headquarters, Bachmann is today part of the Kader group, who model products are made at a Chinese Government joint-venture plant in Dongguan, China. Bachmann's brand is the largest seller, in terms of volume, of model trains in the world. Bachmann primarily specializes in entry level train sets, and premium offerings in many scales. The Spectrum line is the high quality, model railroad product line, offered in N, HO, Large Scale, On30, and Williams O gauge all aimed for the hobbyist market. Bachmann is the producer of the famous railroad village product line known as "Plasticville." The turnover for Bachmann model trains for the year ended 31 December 2006 was approximately $46.87 million, a slight increase of 3.36% as compared to 2005.