Were all stations on the line served until the end of passenger service? I would have thought that there were a lot of low ridership (or maybe even no ridership) stations that could have dropped in earlier years. Even as flag stops they probably weren't needed.
At the end,there were 2 Brewster-Sedgwick Ave "rush hour" round trips and a pair of Sedgwick Ave-Ardsley short turns,
1 Sedgwick Ave-(Brewster)Lake Mahopac round trip on sat, 1 "rush hour" round trip via the "around the horn" route (Brewster-Lake Mahopac-
Goldens Bridge-GCT)along with 1sat only round trip,and 1 sun round trip "around the horn"
source:NYC ETT#2 dated 10/27/1957.