This concept will be greeted with skepticism by some, but is an interesting idea regardless.

The "head" of this train is connected to its " tail" so it obviously moves in a loop. Furthermore, parts of the train move faster/slower than other parts, somewhat like the child's "slinky" toy is capable of. This variable speed is accomplished by widening the gauge of the "rails", and in effect slowly turning each section (coach) sideways to move thru a station to allow entry/exit at a low speed onto a parallel moving sidewalk. Exiting the station, those segments straighten up into single file as the rails move closer together, speeding up as part of the process.

The designers are suggesting speeds up to 40 km/h (about 88 mph) and thruput of 80,000 passengers per hour. They are hoping to convince the city of Busan, South Korea, to proceed with this project.

See the article here:

[kn.theiet.org]

If you have access to the printed copy of Engineering and Technology magazine Vol 4 Issue 10 (June 6 2009) the printed version has more graphics than the online version linked above. This magazine is published in England.