The subway B line is finally back up and running.

Power was restored to the Seventh Avenue-53rd Street station several hours after an outage crippled it during the morning commute.

The track juice went out at about 7:25 a.m., causing the MTA to suspend the line from end to end.

Power was restored to the station at 12:36 p.m., MTA officials said.

The express train rumbles from Brighton Beach in Brooklyn up to Bedford Park in the Bronx.

“On top of forgetting my headphones and there not being any f—- B train service. I just hate today,” one annoyed commuter tweeted.

The agency also rerouted D, E and M service, and told riders to expect delays on the A, B, C, D, E, F, J, M, N, Q and R trains in both directions.

Riders were frustrated by what they say are increasingly common subway delays.

“[The MTA] needs someone new–maybe fresh eyes to look over what could be implemented in this situation,” said rider Judy D, 36. “We shouldn’t have to deal with this.”