All righty, then:
Here's what's scheduled to pass through 36th Street going northbound between 8 and 9 AM weekdays:
M (West End-4 Av local): hold to 8:07-1/2, 8:15-1/2, 8:23-1/2, 8:31-1/2, 8:41-1/2, 8:50-1/2=6 trains
W (West End-4 Av express): 8:01, 8:07-1/2, 8:14, 8:20-1/2, 8:27, 8:33-1/2, 8:39-1/2, 8:46-1/2, 8:55=8 trains
Total=14 West End trains
N (Sea Beach-4 Av express): 8:09, 8:16-1/2, 8:24-1/2, 8:31-1/2, hold to 8:41, 8:49-1/2, 8:58-1/2=7 trains
R (4 Av local): 8:02, 8:10, 8:17-1/2, 8:26, 8:34-1/2, 8:43-1/2, 8:52-1/2=7 trains
So that's 13 4 Av local trains and 15 4 Av express trains in the 8-9 AM hour.
David