comprehensive customized camc , refurbishment and modification of 45 nos . of kone make escalators installed at phase-i , ( underground stations ) for 3 years comprehensive customized camc , refurbishment and modification of 45 nos . of kone makeescalators installed at phase-i , ( underground stations ) for 3 years , customized comprehensive annual maintenance contract including all nessaray labour , consumables and spares ( excluding electrical circuit board , software and hand rail or its jointing ) of kone make escalator installed in phase-i ug station . for 2019-20 ( escalators installed in 2004 & 2005 , i . e . e-1 to e-44 & e-60 ) , customized comprehensive annual maintenance contract including all nessaray labour , consumables and spares ( excluding electrical circuit board , software and hand rail or its jointing ) of kone make escalator installed in phase-i ug station . for 2020-21 ( escalators installed in 2004 & 2005 , i . . e . e-1 to e-44 & e-60 ) , customized comprehensive annual maintenance contract including all nessaray labour , consumables and spares ( excluding electrical circuit board , software and hand rail or its jointing ) of kone make escalator installed in phase-i ug station . for 2021-22 ( escalators installed in 2004 & 2005 , i . . e . e-1 to e-44 & e-60 ) , complete overhauling of escalator including provision of required labour , consumable and spares {but excluding replacement of main & planetary gear box , step chain , both type of tracks , hand rail , floor plate} , modification of escaltor by provision of additional brake in main drive shaft including its actuation mechanism and required control to stop the escalator in case of any eventuality including failure of planetory gear box to prevent its free fall . ( for double motor escalator ) , modification of escalator by provision of additional brake in main drive shaft including its actuation mechanism and required control to stop the escalator in case of any eventuality including failure of planetory gear box to prevent its free fall . ( for single motor escalator )