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But old-fashioned reciprocating engines from Caterpillar and Wartsilla - essentially big, natural gas-fueled versions of the internal combustion engine - are gaining favor, too.

Natural gas reciprocating engines are especially well positioned to take advantage of the surge in demand in gas-rich nations like Indonesia, Malaysia and Australia.

Caterpillar also said it is realigning parts of its reciprocating engine business to better align with "global customer requirements."

Description.—The propelling machinery was of the combination type, having two sets of reciprocating engines driving the wing propellers and a low-pressure turbine working the center propeller.

The indicated horsepower of the "Titanic" was 50,000, developed in two reciprocating engines driving two wing propellers and a single turbine driving a central propeller.