Yes, I must agree, the Colorado DMU is rather... "asthetically challenged" shall we say. Hopefully regular production vehicles will be better looking.
I rode on a couple DMU cars while I was in Japan. They were quite pleasent to ride on, actually. Compared to the well-(ab)used EMU (Electric Multiple Unit) cars used on the Meitetsu line (which operates around Nagoya), where the traction motors and transmissions could outscream a banshe, the diesel engines were quiet and relatively un-noticeable (even in the summer with the car's windows open!).
Here are some links to some pics of some Japanese DMU trainsets
... from the JNR (Japan National Railways - disolved into smaller rail corporations in 1987) era.
http://ts.sakura.ne.jp/~rokko1go/page_e ... nrdc02.htm
... from the JR (Japan Railways - post 1987) era.
http://ts.sakura.ne.jp/~rokko1go/page_e ... nrdc03.htm
(NOTE: on the 201 series cars, there is a reference to the "Sappo" (a mispelling of Sapporo, the capitol city of Hokkaido Prefecture) and "Otaru" side of the cars, this is in reference to the orientation of the car to the terminal cities served by the DMU sets. (So, for example, if the author of the site were discussing the proposed commuter line between the Twin Cities and St. Cloud, MN, they would make refference to the "Minneapolis" (or "St. Paul") end of the car and the "St. Cloud" end.)
... and some Limited Express trainsets
http://ts.sakura.ne.jp/~rokko1go/page_e ... nrdc04.htm
(NOTE: the term "green car" referrs to first class accomodations.)
Granted, they aren't the best looking DMU sets out there, but I think they're much better than the Colorado Railcar sets.