Slam Gate (agent-operated gate, or AOG)

One subway entrance/exit that is not a turnstile is the "slam gate" or "agent-operated gate" (AOG). It's an easier entrance/exit for the handicapped and others.

(Google Groups)
Where to ride in New York City?
... for you, and some of the stations still have the old-fashioned slam gates -- just open ... me an hour and a quarter through nasty traffic, while the subway gets me ...
rec.bicycles - Mar 16 1992, 1:47 am by Unix Guru-in-Training - 12 messages - 8 authors

(Google Groups)
"Slam Gates" in subway
On Nov 22, 1995 00:12:48 in article , Slam gates (or exit gates) if that's what you mean are in use at all manned subway stations. ...
nyc.transit - Nov 23 1995, 7:29 am by Michael Justice - 6 messages - 6 authors

14 August 2005, New York Daily News, The Debate: Keep subway HEETs?, pg. 40:
All of our recently configured areas include at least one agent-operated gate (AOG), or "slam gate."
(Lawrence G. Reuter, president of the Transit Authority - ed.)
(...)
The MTA installed high entrance/exit turnstiles (HEETs) and "slam gates" to stop fare beaters, but the agency has created possible death traps that must be corrected.
(Councilman Peter E. Vallone, Jr. - ed.)