supply of supplying, installation and commissioning of gps base tracking devices with pre installed compatible sim.supplying, installation and commissioning of gps base tracking devices with pre installed compatible sim., for d- route ckp div. branch line, supplying, installation and commissioning of gps base tracking devices with pre installed compatible sim with 3 ( three ) years warranty for monitoring of track patrolling along with mapping, customization in software, software installation, android app, report generation and related assistance as per railway board letter no. 2017 / track-1 / 29 / 8 dated. 16.01.2018 strictly follows ( enclosed ) . the rate including taxes as applicable including following items in addition to cost of device as under:- ( i ) all liabilities including any recurring charges per device. ( ii ) rental charges, voice charges, sms charges, web charges, data charges and others if any for pre installed sim per device up to a period of 3 years from the date of commissioning are including. ( iii ) replacement cost of each not working / defective devices as and when required among supplied gps tracking device of 3 years period from date of commissioning are including. ( iv ) other any unforeseen cost such as repairing of defective gps trackers or other emergent charges ( if any ) for 3 years from date of commissioning. inspection by rites.