Yeah I spend some winters in the Caribbean, they have those like crazy. In Barbados they're called "ZR" (Zed-R -- Due to their license plate markings)... Even the advertisement on the outside of the van you showed "LIME" is the English Caribbean phone company (Landline, Internet, Mobile and Entertainment - LIME)
They work great-- because the private systems will set their time schedules to be more frequent than the government owned providers and they actually hustle to get another fare whenever possible. I don't believe Boston is prepared for the Caribbean-style one though. ;-) As they feature loud music from the radio, so that patrons can hear them approaching, and a musical car horn to boot, nor would Bostonians put up with the conductor's attempts at fitting 4 people per row (to maximize revenues per trip.)
The tourist in Barbados love them, I suspect it is like a fast moving party on wheels whizzing down tight narrow streets and they get all caught up in the excitement. Me personally, I avoid them because sometimes they drive too fast trying to compete with one another on the road and end up getting into an accident with one another. The members of the Royal Barbados Police Force love humiliating them for their bad behaviour on the road, and completely humiliating them.
Anyway- you can see tons of Tourist videos on YouTube. If you search for "Barbados Reggae Bus" or "Barbados boogy bus" or the like." Barbados has a three tiered system to cover all 166 Square Miles. All three charge the same BDS$2 (about US$1) per ride. The smallest one is a ZR which is a small mini van like what you depicted in that article. The next is a slightly larger yellow bus ("Minibus" as called in Barbados.) and then the big blue buses are the ones owned by the government. The first two are owned by private individual(s) while The Crown owns the Transport Board.'
The main Barbados Transport Board (
http://www.transportboard.com/ ) doesn't allow over crowding, nor loud radios on board, nor are drivers able to drive as baddly as ZRs. So it is up to the person in Barbados which they want to take, but it doesn't hurt on days when the government service is running on a Bank holiday schedule... School children can take the government buses free but must pay a $1 for the ZR. Seniors can travel free on all with their ID cards.
Here's one example where the couple seems to be getting a kick out of the experience. (
http://www.youtube.com/watch?v=Rooowqol1Us ) or (
http://www.youtube.com/watch?v=RPnUHeh36Ug ) The guy that comes over to them in the blue basketball jersey is the conductor who gets the fare while the driver is driving. And -no- the Conductor should not be drinking a beer while he's on the job. But that's the bull some of these ZRs try to get away with when the police are not around. That whole industry is considered a sub culture in Barbados since it goes against all norms. But ofcourse the loud music and all that is all great fun for the teenage school children which is why this thing continues.