I went from Grand Central to 14th Street on the 
and then hopped a 
to Brighton Beach. I knew something was wrong when the came in on the local track. The conductor made an announcement "that due to an incident all and 
trains were running local thought the Montague tube." According to trip advisor, the trip should take about 40 minutes. The trip took an extra 30 minutes. According to the MTA app, a train was disabled at DeKalb because of mechanical problems.
Since the bypasses DeKalb during the day, I don't understand why it had to run local. I'll accept there was a good reason to run the on the 
. I don't understand why the had to run local on the . Nobody on the was expecting to get off at local stops. By making local stops, this created a big gap in service in Brooklyn and must have messed up crews at Coney Island waiting for their train. Why couldn't the run express on the local track and make up some of the lost time?