Nice quiz! It's neat to have a consistent thing to identify for different locations, rather than just open-ended "landmarks". Is there an international version?
The terminology is straight from Wikipedia: "In North America, the American Public Transportation Association defines a heavy-rail system as an electric railway with the capacity to handle a heavy volume of traffic. The term is often used to distinguish it from light rail systems, which usually handle a smaller volume of passengers.
"In North America, heavy rail can also refer to rapid transit, when referring to systems with heavier passenger loadings than light rail systems, but distinct from commuter rail and intercity rail systems. It is characterized by high-speed, passenger rail cars running in separate rights-of-way from which all other vehicular and foot traffic are excluded".
"In North America, heavy rail can also refer to rapid transit, when referring to systems with heavier passenger loadings than light rail systems, but distinct from commuter rail and intercity rail systems. It is characterized by high-speed, passenger rail cars running in separate rights-of-way from which all other vehicular and foot traffic are excluded".
Passenger Rail Terminology