[Illustration: One of the Most Powerful Locomotives in the World]
[Illustration: BOILER OF ARTICULATE COMPOUND LOCOMOTIVE.
The wonder of our railroad systems to-day is the growth of the
locomotive. The necessity for economy in hauling long freight trains
has led to the development of this type of engine. Some idea of its
size can be had from the second picture, which shows the boiler and
firebox of the locomotive shown in the first picture. The firebox is so
large that an ordinary narrow-gauge locomotive of the old style can be
comfortably stored in it.