If you use Amtrak to New York City, there are big changes coming Monday. Due to emergency track work at Penn Station, several trains that pass through the Hudson station will use Grand Central Terminal instead. Southbound trains affected are: 230, 236, and 242. Northbound trains coming from Grand Central are: 233, 235, and 239.
Amtrak also says, some trains will be combined, and some cancelled. The emergency track work is being done due to several derailments this Spring. Work is expected to continue until September 1st.
Schedule information here: