ya its old stuff but its under testing till today... its constructed by Konkan Railway & the KR guys are not yet satisfied with their test results... i have seen it operating during one of its many test runs in goa... it suffered a crash in a usual test run few years ago, after that its future has become uncertain... it was also planned for mumbai, but after tht crash all plans got cancelled.
now a metro is planned for mumbai city on the similar lines of delhi metro...