First built in the 1970s, the TankTrain system provided a faster, more economical way to load and unload unit trains of tank cars. Strings of these cars were connected with hoses and valves. Rather than unload or load each car individually, a crew could load or unload the entire string from one end of the train.   The CIBRO TankTrain 3-Pack features an A-end car, Intermediate car and a B-end car with a flashing red End-of-Train-Device.