NY1 has learned exclusively the MTA plans to install subway platform doors on the new number 7 subway line extension.

The doors are designed to relieve the crunch of passengers boarding and exiting subways during rush hour.

The floor-to-ceiling mechanical sliding doors will be at the edge of the platform, similar to those seen on the JFK AirTrain.

According to MTA officials, the doors cost about $2 million per platform. The expense is expected to be made up in energy savings from new cooling systems.

This will be the first time platform doors have ever been tried on the subway.