This Nov. 29, 2018 photo shows one of four escalators that will carry passengers from the concourse level to the mezzanine and train platforms of the East Side Access project beneath Grand Central Terminal in New York.

In this Nov. 29, 2018 photo, a track divides into two, leading into separate tunnels at the East Side Access project beneath Grand Central Terminal in New York.

In this Nov. 29, 2018 photo, an elevator shaft takes shape on the track level of the East Side Access project beneath Grand Central Terminal in New York. Deep in the bedrock 15 stories below New York City's Grand Central Terminal is a cavernous construction site that is slowly being transformed into a new commuter rail hub that will accommodate more than 150,000 passengers a day.

In this Nov. 29, 2018 photo, a construction worker walks on a train platform of the East Side Access project beneath Grand Central Terminal in New York. Deep in the bedrock 15 stories below New York City's Grand Central Terminal is a cavernous construction site that is slowly being transformed into a new commuter rail hub that will accommodate more than 150,000 passengers a day.

In this Nov. 29, 2018 photo, tracks converge in the East Side Access project beneath Grand Central Terminal in New York. The super-pricey new railroad hub is taking shape, dogged by billion-dollar cost overruns and a decade of delays, but still impressive as an engineering marvel.

In this Nov. 29, 2018 photo, construction equipment and materials are on a train platform of the East Side Access project beneath Grand Central Terminal in New York.