Hopefully Union Pacific's testing of two different retrofit technologies for reducing emissions in older locomotives, an experimental "oxidation catalyst" filtering canister and a diesel ...

After all, most of the United States replaced steam-powered locomotives in the late 1950s and early 1960s with their diesel counterparts ... a locomotive delivered by Union Pacific Railroad ...

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.

Jim Vena, the chief executive of Union Pacific, which is investing in fuel-efficient diesel locomotives as well as those that ...

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