Tridents were always faster than most other airliners; the only one which was close was the VC10.
When I was handling flight planning at London ATCC West Drayton, they often filed for a climb TAS of 400 kt and a cruise of 500 where all your Boeings etc would file for 460 cruise. I'm afraid I don't remember what mach number they filed but it was somewhere up around 0.9 with others filing about 0.86.