L trains were stopping at Bedford Avenue due to a broken rail, the MTA said.
More than 2,000 additional people could ride the L train per hour with the improvements, the MTA said.
L train service was disrupted Friday morning over a report of smoke in the subway, officials said.
A woman hit by an L train in Williamsburg Monday was expected to recover.
Ryan Beauchamp, 33, is being sought for questioning in the fight that left Joshua Basin dead.
The suspect is wanted for fighting for Joshua Basin, 20, before he was struck and killed by a train.
Cops have released a sketch of a man wanted for the incident at the Bedford Avenue L train station.
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