I want to know the answer to the following question:
How much fuel did electric train used less than diesel in the middle of 1970 in USSR?
All the background I'm provided with is that "Nevertheless, the cost of diesel fuel was about 1.5 times more (per unit of heat energy content) than that of the fuel used in electric power plants (that generated electricity), thus making electric railways even more energy-cost effective.". Is that enough to answer the question?