Even though the Rs 5,180 crore project would run 25 km from Alwaye to Petta, the opening in June would see the train service operating a distance of 13 km from Alwaye to Palarivattom.
The trials included every procedure -- signalling, status display at the stations and the announcements for passengers. Every aspect was being checked.
Authorities are now waiting for the exact date from Prime Minister Narendra Modi to officially open the service.
It was the Oommen Chandy government which took up the ambitious project after it was first mooted by him in 2005.
Later when the V.S. Achuthanandan government took over in 2006, the project went into a limbo, only to be put back on track by Chandy again in 2011.
Last week the Railway Safety Commissioner gave the nod after checking the entire facility for three days.
There are 11 stations in the 13 km stretch that is being pressed into service. Six of these stations have been fully completed and the remaining ones would be ready in two weeks time, the official added.
Chandy in 2016 flagged off the first test run of the project.