Driverless metro train travels through an underground tunnel in Thessaloniki.
Keywords
train,
tunnel,
underground,
metropolitan,
infrastructure,
urban,
rail,
lighting,
motion,
track,
journey,
technology,
engineering,
construction,
city,
modern,
commute,
speed,
progress,
travel,
design,
environment,
scenery,
architecture,
connectivity,
space,
safety,
efficiency,
civil engineering,
railway,
illumination,
passenger transport,
noise,
dynamic,
express train,
city life,
no people