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Average Freight Train Speed. For the first decade of the 21st century, freight train speed has varied between 20 and 23 mph. The low was reached in 2006, when rail speeds averaged only 20 miles an hour. The figure has increased slightly since 2006 due to a weaker economy that has resulted in shorter lines of cars.
We know that Train A is moving 40 mph, and will therefore travel 40 miles in the hour before Train B leaves Eastford. This means that by the time Train B starts moving, the two trains are only 260 - 40 = 220 miles apart. Now we can use the relative speed of the trains, which is 40 + 70 = 110 mph.