Service at the new Grand Central Madison Long Island Rail Road station will not start this week, MTA officials said Thursday.

One of the zones in the 700,000-square-foot terminal “requires additional work that will take more than a few days,” MTA construction and development president Jamie Torres-Springer said in a statement.

“Given the logistics of concluding testing and launching service, we have advised MTA Chair Janno Lieber that the terminal will not open this week,” he said.

The new east side station for Long Island Rail Road trains was originally supposed to open by the end of the year.

The Grand Central Madison will allow the estimated half of LIRR riders that work on Manhattan’s east side to bypass doubling back from Penn Station.

“We will coordinate with the Federal Railroad Administration to open the new Terminal and commence LIRR service as soon as possible in January,” Torres-Springer said.