Metro-North riders will, for the most part, escape the summer-long rail work at Penn Station that begins on Monday.

Because New Haven Line trains begin and end at Grand Central Terminal, no service changes are expected.

The work, however, will direct some Amtrak trains to GCT through Sept. 10. Amtrak is beginning extensive repairs Monday to tracks and signals in Penn Station, which it owns and operates.

The work was initially scheduled to be done over a few years on nights and weekends, but two recent derailments and other problems that spotlighted the station's aging infrastructure convinced Amtrak to accelerate the work schedule.

Amtrak says no chanegs are expected on Acela Express.

For Northeast Regional Service, three round trip trains (six total trains) between New York and Washington are cancelled. Amtrak service between New York and Boston will operate at currently scheduled levels.

For several hundred thousand commuters on the Long Island Rail Road and New Jersey Transit — as well as Amtrak passengers who ride between Boston and Washington, D.C. — that means fewer trains during peak periods, the result of track closures to accommodate the repairs.

New York Gov. Andrew Cuomo called the Penn Station work a "summer of hell" for commuters.

The LIRR is adding train cars to try and serve as many people as possible, and is urging riders to switch to subways in Brooklyn and Queens. New Jersey Transit is diverting some rush hour trains to Hoboken, where passengers can switch to trains operated by the Port Authority of New York and New Jersey, or to ferries.

Both railroads are offering discounted tickets to those most affected by the disruptions, and have devised plans that use alternative forms of transportation.

Reporting by the Associated Press was used in this story.