What is the Real Time Train Information System (RTIS) project?

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About Real Time Train Information System (RTIS) project:

RTIS devices that use satellite imagery are being installed on the trains to automatically acquire its “movement timing at the stations, including that of arrival and departure or run-through”.
These timings get automatically plotted on the control chart of those trains in the Control Office Application (COA) system.
The project is executed by the Centre for Railway Information Systems (CRIS).
RTIS is developed in collaboration with ISRO. ISRO has launched GSAT satellites that have GAGAN payloads for tracking the movement of trains.
Applications of RTIS:
- RTIS gives mid-section updates with a periodicity of 30 seconds.
- The Train Control can now track the location and speed of RTIS-enabled locomotives/train more closely, without any manual intervention.
- It allows passengers to get the real-time location or train running status of a train on their smartphone.

Q1) What is the Centre for Railway Information Systems (CRIS)?

CRIS (Centre for Railway Information Systems) is an organization under Ministry of Railways. CRIS is a unique combination of competent IT professionals and experienced Railway personnel enabling it to successfully deliver complex Railway IT systems in core areas. Since its inception, CRIS is developing/maintaining softwares for the following key functional areas of the Indian Railways.

Source: Indian Railways ties up with ISRO for real-time train tracking