It's still possible to lease dedicated lines
Not in the uk it isn't.
More cost effective to unilaterally bung eveyone on an ip based system, which is unacceptable for any secure/time critical application.
AFAIK stux moved via usb keys - tyipically SCADA isnt connected by TCP/IP - usually a modern variant of RS 232. So code gets developed & tested in a sim, and shipped to remote sites in some dudes pocket on a flashdrive.
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