Earlier in June, CSMT got a modern electronic interlocking system after a 36-hour block, which enhanced safety and efficiency by replacing traditional mechanical interlocking systems called Route Relay Interlocking (RRI) with an advanced computerised control. The Indian Railways had begun introducing the EI system in 2021.

However, after the new system was installed, trains had been slowed down on the entire system due to the restriction, detaining and delaying trains. Earlier, trains could move once the preceding train cleared just 70 metres from the crossover point. As per the new rule, it mandated trains to travel an additional 250 metres before the following train could proceed. This means the yellow signal (proceed with caution) could be given only after the preceding train was about 320 metres away. Thus, in addition to the caution orders and speed limits at CSMT, all outstation mail/express trains arriving at CSMT platforms 8-18 were delayed. As a cascading effect, this delay was also felt by the mainline suburban system. The harbour line, being a separate corridor, was not affected.

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The CR had requested relaxation of restriction norms for CSMT highlighting the fact that it was a terminating station and that all trains naturally slowed down and passed at lower speeds, which was given approval on Saturday and the system updated on Sunday. The DAC was part of the upgraded signaling system, but it is for the first time it is being used to manage dense traffic  at CSMT. On Monday, suburban trains did not experience any delays.

“The newly installed signaling at CSMT has been successfully upgraded by Central Railway with Railway Board's special approval. This is a pioneering solution for dense traffic using Digital Axle Counters. This will reduce the delays and improve punctuality,” a CR spokesperson said.