Also, looks like powered train testing started on September 25:
Starting September 25, 2023, Caltrain will begin electric train testing on weeknights between San Jose and Mountain View. Testing is expected to continue until Summer 2024. Each trainset must be tested for 1,000 miles before being placed into service, which is planned for September 2024.Reality check: the project was approved in 2016 with an expected start of service in 2020. But by June 2021, they had settled on a late 2024 start date, so I guess September would even beat that goal.
Testing will be conducted Monday through Friday evenings between 8 pm and 4 am with an expected 1-2 test trains per hour. Residents may hear additional noise during testing hours, including grade crossing activations and train horns.