The largest trains run on rails 7-1/4 inches apart. The scale is 1-1/2 inches to the foot for standard gauge or 2-1/2 inches to the foot if you are modeling three foot narrow gauge. It may take two people to pick up a freight car, and some of the engines are truly enormous! Despite these drawbacks this size continues to be the most popular for the live steam enthusiast. The track at Marengo is a mile in length and features a yard, passing sidings, bridges, and operating signals.
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"Gauge" is the Distance Between the Rails.
"Scale" is the Ratio of the Model to the Prototype.
"Standard Gauge" is 4 feet, 8-1/2 inches.