Keep your eyes open and take everything you see in the 'mainstream press' with a grain of salt. Jim Finkle, we now have our eyes on you. Unnecessary drama [PDF warning] arouses suspicion about ulterior motives.
Update: Here is another confirmation (this time from RMS), in case one was needed to show that Reuters was wrong. The previous confirmation came from Peter Brown of the FSF.
Narrowing down to desktops and laptops, and judging by Web requests that go through Clownflare, many people there use GNU/Linux or Google's 'bastardised' version of it (with spyware preloaded)
From what we can gather, the tram ticketing system does not use Windows; we never saw it crashing or rebooting (or showing some Windows logo) in decades, so we assume it runs some kind of Linux