The 37 lakh rail commuters on the central line will have to wait until May to know the expected time of arrival of a suburban train at a station.
The Central Railway (CR) authorities have breached the March deadline to set up the train management system.
Vivek Sahai, chairman of the railway board, inaugurated the control room for this system on Saturday, but it is yet to start operations.
The train management system helps the authorities know the exact location of a train, predict its expected time of arrival at a station and identify any problems along the tracks.
The delay in implementing this system is attributed to the pending work of connecting the additional fifth and sixth lines near Vidyavihar and linking the tracks on the Kurla yard at Vidyavihar with the system.
Sahai on Saturday inspected the site at Vidyavihar, where the fifth and sixth lines have been connected.
Until these works are not complete, CR authorities would not be able to install the system on the Chhatrapati Shivaji Terminus (CST) - Kalyan stretch. The software has already been installed on the tracks on the CST-Kurla stretch.
"The system will not begin functioning for another month until connectivity is made at Vidyavihar. We cannot open the system half-way on only the CST-Kurla stretch," said V Malegaonkar, chief PRO, CR.
"It would have been breach of the code of conduct as polls are on in West Bengal and so no new project can be announced," said a railway official, on condition of anonymity because he is not authorised to talk to the media.
In December 2010, CR officials had conducted a pilot project by placing train management system indicators between CST and Kurla station.