The historical notes in these pages were provided by Maggie Snyder

 History of Railroad Tank Car Development

Source:E-train Magazine - magazine for the train collector's association

Charles P. Hatch of the Empire Transportation Company invented the rail tank car in 1865. It was a flat car with wooden banded tubes mounted on top, capable of carrying 3,500 gallons of crude oil on the Oil Creek and Warren and Franklin Railroads in Pennsylvania. .

Shortly after that, railroads switched to larger wooden tanks mounted horizontally. Saddles bolted to flat cars gave the basic look of tanks cars used by the industry ever since. Empire Transportation Co. built the first metal tank cars in 1869. Mounted directly into wooden frames instead of flat cars, these heavy iron cars solved the problem of leaking wooden tanks and improved safety. As steel technology improved, steel replaced wrought iron making for lighter, but stronger tanks.

Chronology.

1865 - Wooden cars used for the first time to serve the oil fields of Pennsylvania.

1869 - Cast iron replaces wooden tanks. Capacity was about 3,500 gallons per car. The railroads have about 52,000 miles of track and it takes 8 days to go coast to coast on the new Transcontinental Railroad.

1888 - Tank car companies supply tank cars directly to the oil industry, instead of the railroads. Capacities range from 6,000 gallons to 10,000 gallons.

1903 - The tank car industry develops safety standards for construction. Now there are more than 10,000 tank cars in operation and over 260,000 miles of track.

1920 - Welding technology replaces riveting in tank car construction, enhancing the safety of cars. There are now over 400,000 miles of track in the U.S.

1950 - Pipelines and trucks lighten the load of tanks on railroads.

John D. Rockefeller called rail tank cars his "secret weapon" in developing Standard Oil, his small oil company, into a monopolistic force in the industry by controlling transportation. At the turn of the century, Standard's Union Tank Line subsidiary built tank cars to serve only Standard Oil refineries. Rockefeller avoided Congressional pressure on his monopoly by making Union Tank Line a separate, independent company. It still served only Standard Oil. After the Supreme Court broke up the monopoly in 1911, Union Tank Line began to serve other oil markets.

The company changed its name to Union Tank Car Company in 1919 and developed new construction and safety technology to serve the growing petroleum market in the 1920's. During the Depression, Union acquired thousands of surplus tank cars and began leasing them back to shippers, setting a trend in the industry that continues today. A leader in technological developments to increase efficiency and safety in transportation of fluids for over 100 years, Union Tank Car is still the largest tank car lessor in North America.