Despite sales being hurt by postwar inflation and a general economic downturn, Bowser went ahead with design and production of his most ambitious project to date. Working from actual Union Pacific Railroad blueprints with the aid of an early mechanical calculator, Bowser recreated the 4-6-6-4 Challenger in HO scale.
Bowser proceeded with the design and production of his largest project despite postwar inflation and a general economic downturn. With the aid of actual Union Pacific Railroad blueprints and an early mechanical calculator, Bowser replicated the 4-6-6-4 Challenger in HO scale.