The fastest recorded was hauled by 7018 Drysllwyn Castle in April 1958, taking 93 minutes 50 seconds with a top speed of 102 mph. The change to diesel traction saw Warship class D805 Benbow haul an 8-coach Bristolian on the opening day of the 1959 summer timetable in 93 minutes 48 seconds, and over that summer several similar times were recorded until civil engineering concerns placed a 90 mph limit on the line, and the 100 mph running required for such times was no longer possible.
The fastest recorded was achieved by 7018 Drysllwyn Castle in April 1958, taking 93 minutes 50 seconds with a top speed of 102 mph. The change to diesel traction saw Warship class D805 Benbow haul an 8-coach Bristolian on the opening day of the 1959 summer timetable in 93 minutes 48 seconds, and over that summer several similar times were recorded until civil engineering concerns placed a 90 mph limit on the line, and the 100 mph running required for such times was no longer possible.