Like in the NYC Subway?
https://www.cbsnews.com/news/mta-why-has-the-nyc-subway-gone...
> The old-fashioned system requires intensive care. When parts break, which at their age happens often, this busy repair shop springs into action. Like doctors, mechanics examine the patients. Some sound like they're on their last breath. Many of the companies that made these components are long gone. So workers here have to manufacture their own replacement parts.
You have to be aware of the potential for the obsolescence of any service you use. Sometimes they drop the project, sometimes they go out of business. The end result is the same. I don't get mad at PageNet for not supporting my pager any more.