On trials on 25 October 1940, RM 50 achieved a speed of on a section of the Midland Line east of Springfield [REF].
Also, in 1973 or 1974, one of the Silver Fern railcars (RM 1, RM 2 or RM 3) reached a speed in excess of 128 km/h (80 mph) while descending south from National Park Station to Waiouru.