50 Dollars Big Boy

The "Big Boy" in question is the Union Pacific 4-8-8-4 articulated steam locomotive, the largest and most powerful steam engine ever built by axle arrangement. Union Pacific's fleet of 25 Big Boys, constructed by ALCO between 1941 and 1944, were purpose-engineered to haul freight over the Wasatch Range in Utah — a grade that defeated conventional power. The Marshall Islands issued a sprawling series of $50 silver rounds throughout the 1990s under liberal commemorative licensing arrangements, with American railroad subjects among the most frequently contracted themes.

These pieces were sold directly to collectors and never entered circulation in the islands.