Major Bronx 4/5 train service changes are in effect until late February. Here's what you need to know. amNewYork

"Late-night and weekend service changes on Bronx 4 and 5 trains that took effect on Monday and will run through late February, the MTA announced. The MTA is making the adjustments so its crews can replace 37-year-old switches that move trains safely between the Bronx and Manhattan, according to the agency. The work is aimed at reducing dealys and improving service for roughly 1.1 million straphangers."

"Once installed, the new switches are expected to last for 20 years, the MTA said on Tuesday. As of this past Monday, 4 trains are operating in two sections, between Woodlawn and 149 StGrand Concourse in the Bronx, and the Bronx's 3rd Ave138 St 6 train station and New Lots Av in Brooklyn. They are making all local stops in Manhattan."

"The same switch-up will take place on five consecutive weekends between Jan. 23 and Feb. 23. They will begin around 9:45 p.m. on Fridays and run until 5 a.m. on Mondays except for Presidents' Day weekend, where the changes will last until 5 a.m. on Tuesday instead. On those weekends, 5 trains will function as a shuttle between EastchesterDyre Av and E 180 St. in the Bronx."

MTA crews will replace 37-year-old track switches between the Bronx and Manhattan to reduce delays and improve service for roughly 1.1 million riders. The new switches are expected to last 20 years. As part of the work, 4 trains operate in two sections: Woodlawn to 149 StGrand Concourse in the Bronx, and the Bronx's 3rd Ave138 St 6 train station through New Lots Av in Brooklyn, making all local stops in Manhattan. Weeknight changes run 11:45 p.m. to 5 a.m. until Feb. 20. The same adjustments occur over five consecutive weekends from Jan. 23 to Feb. 23, with 5 trains shuttling between EastchesterDyre Av and E 180 St. Free shuttle buses will run between 149 StGrand Concourse and 3 Av138 St on those weekends. Some 4 and 6 trains will be rerouted during rush hours between Jan. 26 and Feb. 20, and riders are advised to use 2 or D trains or Metro-North Hudson and Harlem lines with cross-honored fares.

Read at www.amny.com