The train will continue to use its two diesel engines and ... on Milwaukee Journal Sentinel: The Milwaukee County Zoo is replacing the zoo train's steam locomotive engines ...

There are steam locomotives, and then there’s “Big Boy.” At 604 tons and 132 feet long and with a 4-8-8-4-wheel arrangement, it is the largest, most powerful steam locomotive in the world.

The experimental oxidation catalyst is designed to be installed inside the diesel engine's exhaust manifold on a high-horsepower long-haul locomotive. The special catalytic material chemically ...