Another major milestone was realized on Thursday, December 2nd, as the first Diesel Multiple Unit (DMU), slated for service on the Arrow corridor between San Bernardino and Redlands, was delivered to the Arrow Maintenance Facility in San Bernardino. This new train is the first of three that will serve as the initial fleet for the upcoming service scheduled to begin in the summer of 2022. Over the coming days, the new train will see its final assembly in preparation for an extensive testing period to ensure that Metrolink can continue to offer the public a safe and reliable transit option.