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A larger scale at 1:48 proportion popular for its impressive detail and presence.
O scale models are built to 1:48 proportion (in North America; 1:43.5 in Europe) and typically run on track with rails spaced 1.25 inches apart. O scale was the dominant scale in the early 20th century and remains popular today, especially among collectors and those who appreciate the impressive size and detail possible at this scale. O scale divides into two main camps: 'scale' (two-rail, prototypically accurate) and 'tinplate/toy train' (three-rail, Lionel-style). The larger size makes O scale excellent for garden railways and dramatic indoor displays.