Severe streetcar congestion on streets in downtown Boston created the need for subways and elevated rail.

So elevated rail also wasn't the permanent solution.

The new terminal is raised 15 to 20 feet above the old level to accommodate new elevated rails that eliminate grade crossings in the city.

The trains would breeze past through the elevated rails at a safe speed of 40Kmph.

The elevated rail shall run across three proposed routes.

The elevated rail has since been demolished.

The train hovers above an elevated rail over the fields of Bavaria.

The elevated rail is cheaper than the monorail and can connect to the city's subway system.

These three-car driverless trains run every five minutes on elevated rail and under the taxiways.

Rapid transit systems are typically located either in underground tunnels or on elevated rails above street level.