at 35 mph the emergency brakes will slow the train down to 29 mph. In Restricted Manual mode, the train cannot exceed and the motors automatically cut out at . The ATO and ATP are both disabled and the driver operates the train entirely by sight and according to the signals. This mode is used when there has been an ATP or signal failure, or in a depot where ATP is not used, e.g. West Ruislip and Hainault depots. On the main line, driving in ATO is the same for a train driver as driving through a section where signals have failed. Announcer system The 1992 Stock was the first of its type on the Underground to have a DVA (Digital Voice Announcer) from new. Until 2003, the DVA was voiced by then BBC journalist and presenter Janet Mayo. Since 2003, voice artist Emma Clarke has provided recordings for the 1992 Stock DVA. The new announcer system also includes next station announcements, which the original system did not include. By 2009, the announcements changed to address other lines that are possible to interchange in alphabetical order. Clarke continues to voice the line's announcements to this day. In January 2018, the announcements were again revised for certain stations, to include new lines and connections (such as London Overground, TfL Rail and the construction of station) that did not exist in 2003. Chancery Lane derailment On 25 January 2003 a 1992 Stock train with approximately 500 people on board train derailed as it entered Chancery Lane station on the westbound line. The collision resulted in one door being ripped off and a number of broken windows. 32 passengers received minor injuries. The cause of the derailment was determined to be the detachment of the rearmost traction motor on the fifth car, caused by a gearbox failure. The traction motor was then struck by the remainder of the train as it passed over it, causing the following bogies to derail. The entire 1992 Stock fleet was withdrawn from service the same afternoon, and the Central and Waterloo & City lines were closed for several weeks until modifications were made. This included fitting new traction-motor bolts and secondary brackets to prevent a loose motor from striking the track and causing further damage. The lines re-opened in stages from 14 March 2003. Refurbishment Central line units From 2011 to 2012, the Central line 1992 Stock