
"When the firm was started, Pennsylvania was in the midst of an oil boom, and in 1865 Murray-McDougal built a small flat car with two wooden tubs for the transportation of oil. Dubbed a “tub car,” this car is believed to be one of the first tank cars ever built."
http://www.midcontinent.org/rollingstock/builders/murray-dougal.htm
Hartland, http://www.h-l-w.com/make--take-kits.html