[Does anybody know when the electrification to Hicksville, Huntington and later Ronkonkoma was done?]
The third rail was extended from Mineola to Hicksville and Huntington in 1970, I believe. In those days the line to Huntington went from two main tracks to one track at "Amott" interlocking east of Syosett. I don't recall when the second track to Huntington was put in, but I'd say the late 1980's.
The third rail made in to Ronkonkoma in 1988, if I remember correctly.
Someone from LI could probably verify or correct those dates.
Jim K.
Chicago