In July 1990 some through journeys from Shepherd's Bush to Uxbridge were renumbered 607"Express" and made limited stop. Operated by the same M-class MCWs as 207 the 607s were easily recognised by a bold white box containing the word EXPRESS at the top of the via section of their blue backgound destination blinds. The general effect evoked echoes of the old Trolleybuses which had blue bulbs illuminating their displays.