The driver's cab and exterior design of the locomotives was undertaken by DCA Design, Warwick, UK. Side windows in the locomotive cab are omitted to prevent 'segment flicker' caused by fast running in the tunnel, a potential distraction and cause of driver drowsiness. The driving position was air conditioned and pressurised, and incorporated in-cab TVM 430 signalling. The driving cab also incorporates train manager's facilities, including safety systems such as CCTV, alarms and communication links. There is a second driving position for shunting at the rear of the locomotive.