On 86th Steet is the West End line, south of the longer segment on New Utricht Avnue, and the mid-70s would definitely be used by the B train.
Yes, the view under the elevated coukld be 86th Street and not Broadway. Looked too long to me, but my memory is not that good. The two structures are similar , and both Broadway (Brooklyn) and 86th Street are a bit wider than New Utricht Ave4nue. (New Utricht Avenue was originally simply the right-of-way of Charles Guenther's (Sp?) Brooklyn West End and Bath Beach steam railroad. That railroad's right-of-way a bit south of 86th Street just north of the Stillwell Avenue terminal, used by the B in the mid-70s and now the D, is the very oldest right-of-way still in use in use by the subway system.)
https://ephemeralnewyork.wordpress.com/2010/01/26/1970s-brooklyn-on-tv-welcome-back-kotter/
"It’s 48 seconds of gritty mid-1970s Bensonhurst, featuring shots of graffiti-covered subway cars, the 86th Street elevated train, and New Utrecht High School.
New Utrecht is the real-life Buchanan High School on the show and alma mater of Gabe Kaplan, aka Mr. Kotter."
Enjoyed the music.
Seemed that most or all subway train photos were in the West End line, possible on New Utrich Avenue and the curve leading to 9th Avenue statiom in one. During the graffitti period, around 1967, that line was operated by the T and then the B, but now the D. The scene ubder the elevated would appear to be Broadway (Brooklyn), home of the J.
Here is a pretty good bet this is your exact bus
http://gallery.bustalk.info/displayimage.php?album=384&pos=16
The closing shot always made me want to learn to ride a unicycle as a kid.
Be happy to look into this when I have both the time and the server that permits to me youtube contact.
https://www.youtube.com/watch?v=Mmm3KTa601s man when there was graffiti on the subways in the 1970s
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