As I understand from the pictures on MG2/1's ans SG2/1's wiki pages, the SG2/1 has windows in the corners and turn lights while the MG2/1 doesn't. Right?
The train at the picture of the Main Page of the Wiki has both windows in the corners and turn lights. Is it an SG2/1 or an MG2/1?
Count the amount of cars one train has; there are four of them. It's a fictional model (MB 4400? ) with the side windows. The other 2-car train looks like a driverless MG2/1-based model (MB 4200? ); there seems to be no cabin, only seats (haven't noticed that until now actually).