A backyard railroad is a privately owned, outdoor railroad, most often in miniature, but large enough for one or several persons to ride on. The rail gauge can be anything from 2+1⁄2 in to 7+1⁄2 in or
A backyard railroad, with a 4-4-0 locomotive in 1:8 scale, on a portable track in Finland
Rail transport modelling uses a variety of scales to ensure scale models look correct when placed next to each other. Model railway scales are standardized worldwide by many organizations and hobbyist
One of the smallest (Z scale, 1:220) placed on the buffer beam of one of the largest (Live steam, 1:8) model locomotives