Revenue service
Revenue testing on the "Capitol Corridor" and "San Joaquins" routes in Northern California began on May 25, 2017. During these tests, the trains operated with a second locomotive in case of failure. The Northern California units were formally accepted and approved for solo service on October 23, 2017. The SC-44 entered revenue testing on the Midwest routes in July 2017, with solo revenue service beginning on a "Hiawatha Service" train on August 24, 2017. Revenue service on the "Cascades" route began in November 2017.