The Fiddletown & Copperopolis was a fictional narrow gauge railroad connecting two real California towns created by cartoonist Carl Fallburg. The equipment drawn by Fallburg in his whimsical 19th-century comics was based on real narrow gauge cars from across the country, inspired by the Carson & Colorado, Denver & Rio Grande, Rio Grande Southern, Colorado & Southern, and others, so this decal set is versatile and can work with practically any narrow gauge freight car model.

Inspired by the original comics, this decal set letters three boxcars, two bobber cabooses, and the four-wheel "Leaping Lizard" mail boxcar.