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It's too bad that with the low-floor light rail trains there is no way to string low-floor sections together to make a longer train. The wheels under the central low-floor segment are not powered. Some of the European low-floor street cars have multiple low-floor segments strung together; however, they are designed for lower speeds. The solution used in Portland will provide more room for passengers by eliminating half the cabs; however, it won't be possible to walk between cars.
Dallas lengthened some high-floor trains by adding middle low-floor segments that bridge between the high-floor segments. This type of arrangement could be used to string segments together to make a much longer train; however, there would be high-floor segments in way of each of the bogies.
For more information on the Dallas system, see the following link:
http://world.nycsubway.org/us/dallas/dallas-dart.html
Dallas lengthened some high-floor trains by adding middle low-floor segments that bridge between the high-floor segments. This type of arrangement could be used to string segments together to make a much longer train; however, there would be high-floor segments in way of each of the bogies.

For more information on the Dallas system, see the following link:
http://world.nycsubway.org/us/dallas/dallas-dart.html