"Tornado" was in grey undercoat until final testing was completed, as a precaution against the need to remove the boiler cladding. The livery was described as "works grey" in a "satin finish". While in this undercoat, "Tornado" wore the web address of the A1 Trust on the side of the tender, and the mark RA9 (denoting route availability) on the locomotive cab. On its third main line test run to Newcastle, the web address was replaced with the National Express logo.