Reliance Infrastructure's Delhi Airport Express, the first public-private partnership in Metro rail services, is set to restart operation from 5 am on Tuesday, after remaining shut for six months.
The train will run at 50 kmph.
An expert panel of the Delhi Metro Rail Corporation will review the speed periodically.
The line was designed for 120 kmph, covering the 23 km in 18 minutes.
It was closed in July 2012 on safety grounds.
DMRC awards the contract to Reliance Infrastructure-CAF consortium for the Airport Express Line