A second five-car R211T train is scheduled to begin running on the G line on Wednesday, and another two are due in service by June — all taken from the C line.

The MTA is taking steps to secure its subways — installing alarms and checking IDs — as teams of teen vandals continue to gain access to parked trains.

The combined $7,000 reward comes as police issued an update with surveillance camera footage showing the teens getting off a Manhattan-bound R train early ... two sets of R160 subway cars while ...