4 cars per train. Riders are arranged 2 across in 2 rows for a total of 16 riders per train.
"Green Coaster" may not be quite the right name of this roller coaster. A picture showing the front of the train is difficult to read. The first word ends with "n" and the 3rd and 4th letters are probably the same. "Green" would be a match, but the coaster isn't green in color. The second word in the name is definitely "Coaster".