if i am not wrong, 6311 is the 1st BSEP citaro bus from SLBP
cameo on other service
for BSEP wright, it's 3306
You're wrong, 6310 was the first slbp bsep citaro which cameoed
on other service.
if you want to mention 6311, you should say, both 6310 and 6311
cameoed on 52 on their first day of service...