In January 2009, the railway press reported that a discrepancy had emerged in the 18 November 2008 test, whereby the OTMR recording equipment on the Class 67 being towed had recorded a top speed of around , while the A1 data recorder measured speeds "nearer the " mark. It was stated that while a 10% overspeed is allowed (and may be required) in such new equipment test runs (A4 Class 4464 "Bittern" reached in 2007), "Tornado" had not been planned or authorised to do so on this test. It was suggested that the discrepancy might have been down to the equipment on the Class 67 having had its gearing altered but not having been recalibrated.