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Something I found that I thought I would pass along. I hope it helps.
[FONT="]Scale[/FONT]
[FONT="]HO Scale[/FONT][FONT="]:[/FONT][FONT="] This is the model train scale that has the highest popularity. HO Scale has the advantages of ease of locating paraphernalia, reasonable pricing, and a size that allows a nice layout on a standard plywood sheet measuring 4' x 8'. If you like a realistic setup, HO accomplishes this very nicely. [/FONT]
[FONT="]Scale: 1:87[/FONT]
[FONT="]Gauge: 0.650"[/FONT]
[FONT="]Model Size to Actual Size: 1 inch = 7 feet, 4 inches[/FONT]
[FONT="]N Scale:[/FONT][FONT="] This is a small scale, but permits a large setup even when the available space is small. For those who prioritize the setup and the scenery, N scale works really well. The paraphernalia is small, however, and can be difficult to manipulate. Because its popularity isn't as universal as HO Scale, there are fewer equipment options with N Scale. [/FONT]
[FONT="]Scale: 1:16[/FONT]
[FONT="]Gauge: 0.353"[/FONT]
[FONT="]Model Size to Actual Size: 1 inch = 13 feet, 4 inches[/FONT]