Third Avenue Lightweight Streetcars - Classic Trains Magazine

There is something very unusual about this photo.  125th & 3rd is the south end of the "K," as it is for the replacement M100 bus today.  Usually, a "K" would turn the corner, change ends, use the spring-loaded trailing crossover, and return to 125th Street for the  run to Marble Hill, Broadway and W. 225th Street.  So why is somebody boarding the car?  Does he plan to ride north although boarding at a southbound car-stop?  Or is about to be told by the operator not to board?  Or is the car a pull-out, headed for the 3rd Avenue & 65th Street Carhouse?