Brain-teaser Monday.

As part of Submay, today's brain-teaser is subway related. Which subway system was the first to create and use a corporate logo?

• New York Subway
• Tokyo Metro
• London Underground
• Paris Metro
• Moscow Metro
• Glasgow Subway
• Istanbul Metro
• Budapest Metro
• Chicago "L"
• Boston "T"

Answer to last week's brain-teaser: 8 (One policy, one system, universal service; Reach out and touch someone; The world's networking company; The right choice; We'll always be there; More bars in more places; Your world delivered; Rethink possible)