High-speed trains are not widely available in the U.S. , though some can top nearly 200 mph . Expert : The U.S train is `` enormously complicated , '' nothing like U.S. trains . the Acela Express regulates U.S train speeds and other safety measures . Efforts to expand high-speed programs have met with little success in U.S. .
High-speed trains are not widely available in the U.S. , though some can top 100 mph . Expert : The Spain train is `` enormously complicated , '' nothing like U.S. trains . The Federal Railroad Authority regulates U.S. train speeds and other safety measures . Efforts to expand high-speed programs have met with little success in U.S .