Positive and Negative of using TRAMWAYS as a mode of transportation.?

I'm presuming you're referring to what we in the U.S. call a "trolley". They are great for actually just about anyplace. In the early part of the 20th century a lot of towns in the U.S. were linked by trolley lines. At one point it was possible (by changing from car to car) to travel from Maine to Florida by trolley. They can be as fast as a train. Some interurbans in the U.S. and Canada were capable of speeds in excess of 100 Mph/160 Km/h, so they can be as fast or faster than a bus depending on the equipment, track and route factors. Some trolley lines also provided freight service. They are truly just another form of train. Today, they are usually much lighter in weight than a conventional, locomotive hauled train coach and in the U.S., not subject to the same safety standards. One of the benefits of their being electrically powered is that they can accelerate much quicker than a diesel powered bus. They are however, more expensive to run on longer, heavily traveled routes than a conventional train. U.S. examples of where the conventional trains and trolleys sort of "intersected" would be the Rail Diesel Car ("RDC". See:a href="http://en.wikipedia.org/wiki/Budd_Rail_Diesel_Car" rel="nofollow"http://en.wikipedia.org/wiki/Budd_Rail_D…/a for photo), the Diesel Multiple Unit ("DMU", See a href="http://www.usrailcar.com/dmu-specs.php" rel="nofollow"http://www.usrailcar.com/dmu-specs.php/a for photo and info) or the gas railcar (Aka. "Railbus", "Doodlebug". See: a href="http://en.wikipedia.org/wiki/Doodlebug_%28rail_car%29" rel="nofollow"http://en.wikipedia.org/wiki/Doodlebug_%…/a and a href="http://www.geocities.com/drgwlpd3/DSNG/RB1-2004-07.jpg" rel="nofollow"http://www.geocities.com/drgwlpd3/DSNG/R…/a for photos).