The MTA is describing the changes to the Harlem and New Haven lines as "routine schedule adjustments," while on the Hudson line there will be a temporary construction-related service change in effect on Saturday, Oct. 8 and Sunday, Oct. 9.

According to information from the MTA, there will be other schedule adjustments of two minutes or less that are designed to enhance on-time performance, support critical track maintenance work and capital construction projects and address customer requests for additional service.