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I've never had any issues with malware...although, I have had to fix many family member's computers that became heavily infected. That stupid Antivirus XP (or whatever the crap it's called now) is one of the most annoying ones ever.
The Line 5 sign for "Casa de Campo" was written in Helvetica, but the Line 10 sign for that station, which was just in the opposite side of the platform, was written in Arial :O