The signal problem occurred Friday morning at the Atlantic Av-Barclays Center station. View Full Caption Flickr/Adam Moss

BOERUM HILL — Service on the N, Q, R, B and D trains resumed with delays Friday afternoon after being rerouted due to signal problems citywide, according to the MTA.

#ServAdv: Following an earlier incident at Atlantic Av-Barclays Ctr, #B, #Q and #N train service has resumed with residual delays. — NYCT Subway (@NYCTSubway) January 15, 2016

The northbound Q trains were running on the N line from Coney Island-Stillwell Avenue to DeKalb Avenue on Friday morning, while northbound B trains were running on the D line from Coney Island-Stillwell Avenue to Atlantic Avenue-Barclays Center.

So it's basically no service https://t.co/Y2Dh5CePjQ — ChickFilA Concubine (@EatWithNia) January 15, 2016

I've been underground for 2 hours! https://t.co/537onyjuc1 — John Thrasher (@jthrasher) January 15, 2016

1h and 40 mins to get from the Barclays center to canal st. Could have gone to Philadelphia in that time. Congrats @NYCTSubway — Alyssa Neilson (@AlyssaNeilson) January 15, 2016

The B and D trains were running with delays Thursday afternoon due to a broken rail.