We were sitting at the Ave 26 station - also known to some as the Cypress Hill/Linkin Park stop. We were stopped there for a little longer than usual. The driver comes on the loudspeaker and declares there's a bit of traffic out there, and we need to wait at the station for things to clear.
There are no at grade rail crossings between this station and Chinatown.
Obviously, the trains were gettng to be too close together. But, we laughed about it.