Earlier in the week, Crossrail chief executive Mark Wild stated it was imminent, though couldn’t give a date.
Trial operations sees the last stage of testing for the network using volunteers and staff to check for issues. It follows a crucial software upgrade named ELR100.
Trial running preceded trial operations and saw service levels ramped up from an initial four trains per hour between Abbey Wood and Paddington. Eight per hour followed.
The full service will be 12 trains per hour on the Paddington to Abbey Wood stretch. The core from Paddington to Whitechapel will see 24 trains per hour with services to Heathrow and Reading in the west, and Shenfield and Abbey Wood in the east.
Opening should follow in spring next year depending on whether testing sees minimal glitches with crucial software ELR100 during trial operations.