Which organisation launched first indigenous signal system?

The Delhi Metro Rail Corporation (DMRC) on Tuesday took a major step towards development of an indigenously-built communication-based train control with the launch of i-ATS - the first Made-in-India signalling system. The ATS (or Automatic Train Supervision) is a computer-based system, which manages train operations, including basic functioning such as running and halting. The i-ATS will significantly reduce the dependence of Indian Metros on foreign vendors dealing with such technologies, officials said.