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Code is how high the rail is in thousanths of an inch ie code 100 is .100 inch high. The NHRA site has a guide to this, but code 100 is a standard that is oversize but all equipment meeting NMRA standards will run on it. Code 83 is closer to real mainline scale, but some equipment may bottom out their flanges on it. There is also 70 and 55 and others on the market for yards, sidings, old time. Lots claim 83 is the most popular size and all should use it, but last I seen code 100 still outsold all others by 3 to one. Quick way to tell them apart is 100 has black ties and 83 has brown. Rule of thumb... If you run lots of old and or cheap cars like bachmann or lifelike 1000 (under $7 new) use 100. If you want closer to scale track use 83 and maybe replace wheel and or trucks.
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