Not to mention streetcars as a possible vehicle (no pun intended) for alternative power plants or fuel sources. Some of the arguments against alternatives for t

Not to mention streetcars as a possible vehicle (no pun intended) for alternative power plants or fuel sources. Some of the arguments against alternatives for the internal combustion engine fall away if you do not have to deal with the needs that consumer cars have. Gyro power plant for example: http://en.wikipedia.org/wiki/Gyrobus http://en.wikipedia.org/wiki/Gyrobus Compressed air: http://en.wikipedia.org/wiki/Pneumatic_motor http://en.wikipedia.org/wiki/Pneumatic_motor