Testing for the zero-emissions passenger train that will one day run on the San Bernardino Line will disrupt Arrow service this week, Metrolink announced.

The Zero-Emission Multiple Unit will become part of Metrolink’s 9-mile Arrow service, which runs between Redlands and San Bernardino. The train uses hybrid hydrogen and battery technology to power its electrical systems.

Testing of the unit this week will suspend service of the last four late-night Arrow trains today and Wednesday as well as the first two early-morning trains Wednesday and Thursday.

Arrow service will be completely suspended Saturday and Sunday.

Alternate transportation is not provided by Metrolink during the Arrow service suspensions, though Omnitrans bus service between Redlands and San Bernardino may be an option for passengers.

Metrolink service to and from Redlands, meanwhile, will operate normally, the agency said.

During the testing, Metrolink will be evaluating GPS-based safety technology that can stop a train and prevent collisions with other trains, according to the agency’s website.