Time since the first passenger steam railway service

Time since the first passenger steam railway service (199 y)

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Time since the first passenger steam railway service (199 y)

is 1/250 of Time since first humans in Australia (50,000 y)...more
is 1/20 of Time since earliest wheeled vehicles (4,000 y)...more
is 1/10 of Time since the birth of Hero of Alexandria (2,014 y)...more
is 1/5 of Time since the birth of Omar Khayyam (976 y)...more
is about as big as Time since the first iron steamship crossed the English Channel (202 y)...more
is 2.5 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)...more
is 2.5 x Lifespan of human being (80 y)...more
is 5 x Time since first Apple Macintosh Computer launched (40 y)...more
is 20 x Time since first Tesla Model S launched (10 y)...more
is 100 x Lifespan of rat (2 y)...more

If this was a standard unit ...