So apparently last night there were signal problems on the 7th Avenue line. Seems like every Monday there's a problem with that line... 
What I didn't get was that the 
seemed to be running fairly well, but 
service was curtailed significantly, which is what more people needed. During rush hour they were running trains every 17 - 20 minutes and suggesting that people use the as an alternative, even though the only runs to 148th street. Some trains were running via the Lexington Avenue line, which doesn't make sense seeing how congested the Lexington Avenue line is already with the 
and 
. So here are my questions:
Do they run fewer trains when they have to run some trains via the Lexington Avenue line? I ask this because if the are at maximum capacity, having some trains run as trains up to 149th street would just exacerbate an already difficult situation wouldn't it? With the already running so poorly on 7th Avenue, I have a hard time understanding how sending it on the Lex line solves the problem when there are signal problems? Is more train service run or how does that work? Also I noticed that they had some trains running on the 
line later on from 96th street to Times Square. What was up with that? 