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NEW YORK — Snow accumulation and ice on the tracks forced the shutdown Saturday of all above-ground subway lines, Gov. Andrew Cuomo said.

All elevated transit lines stopped running at 4 p.m., the governor said. Below-ground subway service will remain in effect, but commuters are warned to expect delays.

A map was released to show which lines will stop at which stations. Click here to see that map.

Earlier in the day, the MTA announced city buses will suspend service at noon until further notice due to deteriorating conditions on the roads.

Commuter trains also stopped running at 4 p.m., the governor said. Metro-North and Long Island Rail Road trains have been getting stranded on their routes, prompting the decision, he said.

The snow started earlier than was predicted and is coming down faster than anticipated. Already anticipated snow totals have been updated multiple times, with the latest count at 24 to 30 inches for parts of the city and New Jersey, according to the National Weather Service.

“The plows just can’t keep up with this snowfall,” Cuomo said midday Saturday.

He initiated a travel ban for New York City and Long Island as well as arteries from New Jersey leading into downstate New York starting at 2:30 p.m.