UPDATE: 11:30 a.m. Southbound service is restored with scattered delays.
Following are alternative routes to Grand Central Terminal provided by the Metro-North Railroard Web site:
Harlem Line Customers: Train service is running Southbound to Woodlawn where customers can transfer to the subway for service to Grand Central Terminal.
Hudson Line Customers: Train service is running Southbound to Marble Hill where customers can transfer to the subway for service to Grand Central Terminal.