Train Set Scales and Layouts

Collecting scale models of rail transport systems began in the 1840s. Model locomotives, boxcars, streetcars, train tracks, signaling, roads, model train buildings, and scenery were not to scale. With time, model train sets followed an approximate scale and gauge. As collecting and building model railways grew in popularity, serious modelers sought precisely scaled pieces. These finescale standards are not always found in mass-produced train sets, because some over-scaling is necessary to guarantee quality operation and reasonable pricing.

There are model railroaders who simply own and enjoy their model train sets, and those who invest large amounts of money and time to construct a themed layout embellished with defined and scaled scenery. Scaling ranges from a matchbox size to models large enough to ride. Scales of 1:20.3 to 1:24 (G/F-scale) are common for backyard modeling; and 1:4 to 1:8 are used for park rides. These scales are more precise than those used for indoor model trains.

Refined and Defined
Scale refers to the model train's proportions to the actual train it replicates; gauge is the measurement between the rails of the track. Z scale (1:220) represents the tiniest (matchbox) of trains. N scale (1:148-1:160) gives the advantages of amassing elaborate model train layouts in a limited amount of space. N is abbreviated from Nine; the distance between the inside edges of rails is nine millimeters. TT-scale (tabletop) model trains are built on a 1:120 scale.

The most popular scale among hobbyists is HO (approximately Half of O scaling or 1:87). Typically, the engine is approximately two inches tall and averages from four to 12 inches long. Narrow-gauge scales (HOn3 and Nn3) have narrower spacing between the tracks. Because of its popularity, there is a broad selection of scenery, buildings, etc. that complement this model train scale size.

O scale (1:48) is the most popular for childrens toy trains. This is similar to the scaling of die-cast vehicles and is becoming a popular scaling with Lego collectors.

Boring Basics
Sizes of model train track layouts vary from shelf-top designs to layouts that fill rooms. Here are some basic train track arrangements.

• The continuous loop is a oval or round train track layout.
• Point-to-point is a straight-line track with a station at each end.
• Out-and-back pear-shaped track has a reverse loop to return to the station.