Section 20(7)(vi) in The Bangalore Metro Railway (General) Rules, 2011
(vi)if the Automatic Train is not available from the track or loco or cab side equipment due to fault otherwise the train may be driven with Traffic controller's permission in Restricted mode and in this mode tile on board Automatic Train Protection equipment restricts the speed of the train to twenty-five Kilometers per hour, this mode shall be used in depots and exceptionally on running lines when authorised by the Traffic Controller;