Residual delays of up to two hours remained on the Long Island Rail Road's Long Beach branch as the afternoon rush hour got under way after track work caused a third rail power failure, the commuter rail said.

Power to one track went out east of Valley Stream shortly after 11:30 a.m. as workers replaced wooden ties between the rails on an adjacent track, the LIRR said.

Service was restored about 1:45 p.m., and the railroad was investigating the exact cause of the power failure, said LIRR spokeswoman Meredith Daniels.

The wooden ties were being replaced by machine when a "mechanical issue" occurred and somehow caused the power outage, she said. It was unclear what exactly happened, she said.

Earlier, an LIRR train struck and injured a woman at Great Neck station on Monday, forcing a brief suspension of service on the Port Washington branch, railroad officials said.

Officials said trains on the branch are operating with residual delays of up to 45 minutes.

Daniels said the incident occurred just before 11:30 a.m. and involved the 10:49 a.m. train from Penn Station to Port Washington. No one was injured aboard the train.

advertisement | advertise on newsday

Service was restored about 12:15 p.m.

Daniels said the victim, whose identity has not been released, was taken to North Shore-Long Island Jewish Medical Center with undisclosed injuries. Her condition was not immediately known.

Circumstances surrounding the incident are under investigation, Daniels said. She said the first four cars had reached the platform at the station.

With John Valenti