The much-delayed Yellow Line Mumbai Metro 2B crossed a milestone on Sunday—four years after it was slated to be operational—when a 5.4-km stretch of the line between Diamond Garden in Chembur and Mandale in Mankhurd was live-charged. This means the overhead wires are now considered 'live'. Officials said the first train trials on the line will begin on April 16.

The date coincides with the day trains first ran in Mumbai 172 years ago, an event regarded as the foundation day of Indian Railways. This will be the first new Metro to ply in the eastern suburbs in the past ten years after the Blue Line 1 had started operations from Ghatkopar. The other three lines cater to the western suburbs. Though the deadline for beginning operations had been given as December 2025, sources said the early beginning of train trial was pushed by Metropolitan Commissioner Dr Sanjay Mukherjee, who has been reviewing the progress of all lines closely.