When they describe subway art what are they referring to?

CHARACTER OR HISTORY OF ITS PARTICULAR NEIGHBORHOOD.

2. Reflect: have you ever ridden on the subway? Did you see any art? Should we have art along our subway tunnels and our stations? I HAVE NEVER BEEN ON ONE BUT I WOULD LIKE TO

3. How do they control the subway train traffic in the new subway systems?
COMPUTER
4. How have the train operators been practicing for when the Metro Red Line Subway lines open? COMPUTER

5. When do they test the first Red Line train? 4 MONTHS