Model Power - 3417 - Tank Car, Triple Dome, 40 Foot - Tank Train - 10450

Model Information: This car was first produced by Mehano in the late 1960s or early 1970s. It is essentially a knock-off of the Atlas/Roco 3-dome model from 1967. It was imported by MRC, Model Power and Life-Like. Life-Like later produced a Chinese knock-off of this car. Hence the Life-Like model is a knock-off of a knock-off. Meta-knockoff?

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: General American's TankTrain system of interconnecting tank cars provides shippers with a quick and cost-effective method of moving large volumes of bulk liquids. The TankTrain system consists of an entire string of cars that can be loaded or unloaded from a single System connection. The last car in each set (of 12 cars) is left 3/4 full. Then nitrogen gas (non-flammable, non-toxic) is used to purge the loading lines of any remaining oil which fills the last car.

The TankTrain System was first tested by the Alaska Railroad. The ARR purchased two sets of three that were linked together. They didn't stay that way though and eventually wound up as individual cars. Some ARR crew members felt they were more bother than they were worth. The cars had to be kept turned in a certain direction which wasn't always operationally easy. If one car was Bad Ordered then the whole string had to go in the shop. The ARR ceased using them in the late 1970s and they were all shipped to the lower 48. A much updated version of the TankTrain was later fielded for the Southern Pacific "Oilcan" that went from central California, over Tehachapi Pass, to Los Angeles. Later, the run went from Mojave to L.A.,

Brand/Importer Information: Founded in the late 1960's by Michael Tager, the 3rd generation business specializes in quality hobby products serving the toy and hobby markets worldwide. During its 50 years of operation, Model Power has developed a full line of model railroading products, die-cast metal aircraft, and die-cast metal cars and trucks.

In early 2014, Model Power ceased its business operations. Its extensive portfolio of intellectual property and physical assets are now exclusively produced, marketed, sold, and distributed by MRC (Model Power, MetalTrain and Mantua) and by Daron (Postage Stamp Airplanes and Airliner Collection).

Manufacturer Information: Mehano is a Slovenian toy manufacturer located in Izola, Slovenija. The company was founded as Mehanotehnika and was producing toys starting in June 1953. They first exhibited at the Nuerenberg Toy Fair in 1959. Mehano produced a number of different locomotives and rolling stock models for the North American market in the 1960s and 1970s. Companies such as Atlas and Life-Like imported a huge variety of their products. Generally they can easily be recognized as they are stamped "Yugosolavia" on the underframe. The company was formally renamed "Mehano" in 1990. Izola today is part of the country of Slovenia since the breakup of Yugoslavia.
Mehano filed for bankruptcy in 2008, but still continued to exist and operate. Since 2012, Mehano products are distributed by Lemke.