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HO Track Codes Explained: Why Code 83 is the Perfect Balance of Realism and Reliability If you’ve ever browsed HO scale track and wondered what “Code 83” or “Code 100” means, you’re not alone. These numbers are simply the height of the rail in thousandths of an inch — Code 83 is 0.083" tall, while Code 100 is 0.100". That tiny difference can have a big impact on how your layout looks and runs. Why Code 83 is the Modern Standard For most contemporary layo …