In NYC, track was a big deal in the 60s, 70, and 80s.
The Staten Island schools did very well and each coach trained their athletes differently. Some used the interval method, some just had their athletes run mileage. But they were very great leaders and motivators. At the same time you had a few distance powerhouses, just a few, in each borough, coached by great motivators.
It's not just about training it's motivating kids to go out for the team and keeping them interested.
At least that's what a PSAL coach from the era told me. His team ran easy runs, tempo runs and fartlek all year. His athletes bought in and ran the 4× mile in 17:20.
The PSAL didn't have so many sports that syphoned athletes away from track and their were more neighborhood schools. Billy Welsh from New Dorp gave a clinic about 20 years ago and mentioned how his seniors used to drive under classmen to school a few days a week for morning workouts. This could not take place in Manhattan and in the poor areas of the city this day and age.
The best PSAL distance coaches of the last 15 years are also great motivators. It's not the workouts. Mark Mendes, Phil Zodda, Sean Rice, John Padula, the MSIT and Curtis staffs were in the right schools and had very good teams- they all train their athletes differently.