Metro began submitting testing plans for these railcars despite all of them being removed from service for a safety investigation following the Blue Line derailment back in October. Whilst Metro has been running only legacy 2000/3000, and some 6000 series trains, the two clips in this video show the Kawasaki 7000 series trains that Metro was test running as a "No Passenger Test Train". These were one of the trains that were undergoing trial runs up and down the Green/Yellow Lines without passengers for a period of a few weeks to gather testing results. After that, Metro moved onto the next step, which was determining new inspection intervals. The trains that were in the testing phase included simulations such as using weights in the carriages, which depicted a train of actual passengers.

Also, those lights you see at the bottom of the train on the last car just below the coupler are most probably for testing crews to constantly monitor the axles and whether or not they would slip out of position. In addition to that, exclusive to the 7000 series cars are cameras within the wheel trucks according to what a Metro official told me.

In mid December, some trains returned to revenue service, but however, a few days later, Metro paused on the gradual introduction of these trains, so as a result, they were out of service for further inspections.

As of June 2022, 64 cars (equivalent to 8 sets) have returned to service specifically on the Green/Yellow lines only.

The following stations were filmed in the clips:
1. Mt. Vernon Square/7th Street Convention Center towards Greenbelt.

2. College Park University of Maryland towards downtown.

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Filmed November 9, 2021

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