F Scale is 1:20.32.
2.781 in (70.69 mm)


LGB Track gauge is 45 mm. If we pretend this is 3 foot gauge, it's 15 mm per foot. 1:20.32 ratio. This has been designated Fn3. See NMRA STANDARDS S-1.2 Standards for Scale Models

Arch Bar Trucks with 33 in. ribbed back wheels (1:29 Scale Ratio "G" Scale) 1.138 inches actual
Kadee Product Number: 972
Walthers Product Number: 380-972
wheels would be 23.12" at 15 mm to the foot

RGS 30 pound/yard rail = 3.125" high = 0.153" at 15 mm to the foot
DRGW 70 pound/yard rail = 4.625" high = 0.227" at 15 mm to the foot

Rail Sizes12 lb

Rail Size	Scale Height	Proto Size	source
Code 55	1.1176"		Micro Engineering
Code 70	1.4224"		Micro Engineering
Code 83	1.68656"		Micro Engineering
Code 100	2.032"	75 lb	Micro Engineering
Code 125	2.54"	20 lb	Micro Engineering
Code 148	3.00736"	30 lb	Micro Engineering
Code 215	4.3688	60 lb	LLagas Creek
Code 250	5.08	80 lb	LLagas Creek

Jim McDaniel Gallery photo's of scratch-built cars and trucks

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Resources
Cumberland Model Engineering F Gauge Wheel & Track Standards

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Sources
1:20.3 Fn3 Archbar Trucks and Wheelsets
1/20.3 & Gauge 1 Sierra Valley Wheels Solid
Iron Creek Shops F Scale parts