How long does it take 150 car freight train traveling 50 mph to stop?
A 150-car freight train at 50 mph needs 8,000 feet (1 and 1/2 miles) to stop; an 8-car passenger train at 79 mph needs about 6,000 feet (1 and 1/8 miles) to stop.
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Trains can't stop quickly or swerve. The average freight train is about 1 to 1¼ miles in length (90 to 120 rail cars). When it's moving at 55 miles an hour, it can take a mile or more to stop after the locomotive engineer fully applies the emergency brake.
The average freight train consisting of 100 cars and weighing anywhere from 12 million to 20 million pounds takes over a mile to stop in emergency braking. There are brakes on every wheel, but it takes that long for all of those brakes to overcome the momentum of the tremendous weight pushing the train.
The average freight train, traveling at 55 MPH, takes anywhere from 1 to 1½ miles to stop. Traveling at the same speed, the average automobile can stop in only 200 feet.
A train of 150 cars—the FRA's unofficial definition of a long train—carrying iron ore would run about 3,500 feet long, but an intermodal train of the same number of cars might measure 33,000 feet, according to John Gray, the AAR's senior vice president of policy and economics.
So, about 50% of freight trains are between 5,400 feet and 14,000 feet long. Despite a median length of about 1 mile, 50% of trains are over 1 mile long today. Average train lengths have steadily increased over recent years due to several factors. Market demand is a major driving force in train length.
The long noses are designed to reduce sonic booms in tunnels. Casablanca express: Africa's first, and so far only, dedicated high speed line carries trains at up to 320 kph (200 mph) between the port city of Tangiers and Casablanca.
Modern trains can travel seamlessly from conventional track to high-speed track. They simply travel slower while on conventional track. Passenger service on the conventional freight lines that criss-cross the United States today is limited to 90 mph at best.
The average freight train is about 1 to 1¼ miles in length (90 to 120 rail cars). When it's moving at 55 miles an hour, it can take a mile or more to stop after the locomotive engineer fully applies the emergency brake. An 8-car passenger train moving at 80 miles an hour needs about a mile to stop.