Imagine travelling from Miami, Florida to Chattanooga, Tennessee, and changing in Atlanta from a steel-wheeled fast train to a magnetic levitation one.

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Tech startup life is a fast-moving train with new entrants and new opportunities unfolding, sometimes on a daily basis.

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Investing in it would be much like standing in front of a fast-moving train.

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This system, Positive Train Control (PTC), is intended to stop or slow a train automatically if a driver goes too fast or passes a red signal.

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Robin Moulna, 38, a manager at a fast-food restaurant, was surprised to receive a call from his brother while waiting for an F train in the Rockefeller Center subway station, two levels underground.

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"I was fast asleep this morning and it sounded like a train running around the outside of the house, " he said.

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He said there had been a cut in the number of deaths, train use had increased and capital investment was growing fast.

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If the Polar Arrow or some other fast train went by slowly, Fyodorov could sometimes make out the sound of the radio or a portable gramophone.

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With respect to fast moving consumer goods, excessive discounting (pricing too low) can effectively train consumers to look for a certain sale price and wait for that price before they buy.

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