UP4012 Big Boy - How big is a Big Boy?
The UP Big Boy stands more
than 16 feet tall.  It is about
140 feet from its cow-catcher
to the end of its tender.  Fully
loaded with water and coal,
Big Boys weigh about one
million pounds.
Looks to us like Boxcar Mac
would fit inside one of the
cylinders.

These engines are so big and
heavy that they cannot run on
the tracks in this part of the
country.  In fact, the only
disappointing thing about
Steamtown's Big Boy is that
it cannot run.  Oh well, you can't have everything.

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