The Kavi Subhash-Hemanta Mukhopadhyay stretch will be unveiled soon.
The new line will open in January 2024.
Right now, trial runs are taking place to assess various factors.
It recently completed five successful round trips.
The stretch covers 3 stations - Satyajit Ray, Jyotirindra Nandi and Kavi Sukanta.
The stretch has received the necessary Commissioner of Railway Safety (CRS) approval.
Authorities have implemented a single-ticket system from Blue Line to Orange Line.
The ticket price ranges from Rs 20 to Rs 45.
During trial runs, authorities used an air-conditioned Medha rake.
Officials focused on track conditions, power supply and station staff response.