Nearly a week after a circuit failed in Mount Vernon, the line has gotten a power boost from Con Edison's temporary substation in Harrison.
Metro North says trains will be operating at about 65 percent capacity beginning Wednesday. That's up from 50 percent since the disruption began.
Interstate 95, the Merritt Parkway and other highways in southeast Connecticut have been jammed with by traffic tie-ups as commuters look for alternative ways to get to Grand Central Terminal.
Officials say normal commuter rail service between New Haven and New York City should resume by Oct. 8.
The MTA board on Tuesday unanimously approved a credit for customers holding monthly or weekly tickets during the power outage.
Connecticut Gov. Dannel P. Malloy, who had urged the credit, called it a "step in the right direction."
The agency says the cost of the outage is $2 million per week for each week the disruption continues.
Four additional park-and-ride lots continue to offer bus service. They are located at:
Officials warn that the Harlem line will be crowded, and riders who are able are encouraged to take the Hudson line, which is expected to have the fewest number of passengers.