>>aftbit+UB1
I'd wonder if that is stale data? There is a small building that looks an awful lot like a central office at that location [0], but I'd find it a bit farfetched that a 355A would still be active in the PSTN at this late date, given that Nantes, QC was supposed to be the last step in Zone 1. Also, while things may be different in the Wyoming desert, landlines are rapidly disappearing in general. If it's still in use, I'd guess it's either a DMS-10 (those are fast disappearing too), or a modern packet switch or cellular node.
I wonder how much old equipment is still abandoned in place? A fair number of museum finds have come more-or-less intact from old COs, and newer equipment often occupied but a corner of older buildings.
[0] https://www.google.com/maps/@42.812278,-107.6168592,463m/dat...