It was another miserable morning on New York City’s subways on Monday as delays snarled more than a dozen lines, with an antiquated signal system blamed for much of the trouble.

Signal problems were seemingly everywhere. They struck stations at West Fourth Street and Wall Street in Manhattan. They cropped up at the Mets-Willets Point station in Queens and at Church Avenue in Brooklyn. And they appeared in the Bronx at the Eastchester-Dyre Avenue stop.

The Metropolitan Transportation Authority said that workers were on the scene investigating the problems and that riders should allow for additional travel time.

Around 9:15 a.m., the authority’s website listed a gloomy tally of delays across the city.

“Another Monday, another day of signal malfunctions” on the F line, a woman identifying herself as Phoebe Stein posted on Twitter. “Late to work again.”