These locomotives, designated USA 190 to USA 200, were constructed by Baldwin Locomotive Works as gauge and shipped fully assembled. No modification was needed. The MacArthur was designed by the American Locomotive Company for gauge and the smaller gauges were accommodated with various widths spacers (rings) between the wheels and the truck side frames on same length axles. The spacers were wide in the case of gauge and wide in the case of . In total, nearly 800 MacArthurs were produced by ALCO, Baldwin, and a few other manufacturers.