Nice collection of screencaps! For whatever it's worth, those were shot in several different locations around the set. I haven't been able to determine whether it was all the same exact set of quadruple turbolift doors vs. different quad sets at different sites, but in any case here are the site identifications from my recent survey of every turbolift appearance in the series. (The letter/number designations I use here are explained further below.)Any excuse to break out my obsessive collection of the TOS sets
And now for my codes. No single set plan is ideal for showing all turbolift sites simultaneously; here I've used what I believe is the last one available, as seen in The Making of Star Trek. It notably does not show how in season 1 the engineering corridor was angled a bit more clockwise and the curved corridor was thus shorter by one or two sections at the top.
B – Bridge.
C – Clockwise end of curved corridor. C0 appears on the set plan for The Enemy Within, but was never used, probably due it blocking stagehand access to the ward room door mechanism. C1 debuted in The Man Trap with the weird "blob-out" wall that made the corridor appear to make an outboard turn at that end, as seen on the set plans for Charlie X and Balance of Terror. (This season-one corridor bend-out continued through to at least Space Seed, and can sometimes give the impression that a C1 scene is an A1; so you have to look carefully.) In season 2, C1 was replaced by a cleaner, more inline C2 setup that was first seen in The Doomsday Machine; its last appearance was in The Way to Eden.
D – Dummy turbolift made by replacing the yellow side doors of the briefing room with red ones; this is the only lift site that has no filmable interior. Clearly depicted as a turbolift only in Wink of an Eye, Let That Be Your Last Battlefield, and The Mark of Gideon. The red doors were still visible in The Savage Curtain and Turnabout Intruder, although with no other evidence of turboliftery (no black number placard, no red/green wall appliance, and nobody going in or out).
E – Engineering corridor. Appeared only twice (Mudd's Women, Is There in Truth No Beauty?), and was adjusted with the season 2 corridor upgrade.
H – Hangar deck access overlap. Debuted in The Corbomite Maneuver (see Mytran's screencap above). This site was used repeatedly throughout season 1, skipped season 2 entirely, and then finally reappeared in season 3 for just one episode, Elaan of Troyius.
T – Transporter overlap. T1 also debuted in Corbomite and also was used repeatedly in season 1, at least through Little Girls, then lay dormant until season 2 (Amok Time). This site was used sporadically through that season until The Deadly Years, and then for By Any Other Name the lift was moved slightly over to position T2, another site that was last seen in Elaan. The position marked T3 appears on the set plan for Journey to Babel, but as far as I can tell was never actually used. (Perhaps that marking was intended to identify the T2 site, but it is too far clockwise to represent what was seen on screen; so maybe it was just a hypothetical location that was never dressed/shot, or that never survived the final edit of any episode.)
As far as I can tell, turbolift outer doors were always red with one and a half exceptions. The only "true" exception is in The Naked Time, where site H inexplicably had blue doors during its three appearances in that episode. The "false" exception occurs in The Changeling, where we see Kirk standing in front of a pair of opening green doors, followed by Nomad seeming to exit a lift through those doors. In reality, the plot has Nomad exiting the sickbay (whose doors Kirk is indeed standing in front of), but for the probe's close-up the editor used footage from a scene of Nomad entering the bridge. We clearly see the turbolift interior, before a camera cut shows us McCoy cradling Chapel on the sickbay floor. Of course I do not count this as a turbolift appearance; just an unfortunate editing cheat.
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