Erm... There's a lot going on inside an electrically powered train. Even a diesel engine has a computer managing fuel flow and diagnostics.
More importantly, you need networked computers to handle automatic train safety systems, a requirement in the EU from what I understand, after several notable rail crashes up to the 70's.
Absolutely. Maybe an exception for video game multiplayer cheating, but that's the only thing I can think of. Any other situation I can think of just enriches the computer to the massive detriment of the user.
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