Cumberland Model Engineering

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F Scale Standards

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F Scale Wheel & Track Standards

F Gauge Track Standards (S3)

G	Track Gauge	Minimum	70.64 mm	2.781"
		Maximum	71.40 mm	2.811"
C	Check Gauge	Minimum	68.28 mm	2.688"
S	Span	Minimum	66.24 mm	2.608"
F	Flangeway	Minimum	2.03 mm	0.080"
		Maximum	2.59 mm	0.102"
H	Flange Clearance	Minimum	2.19 mm	0.086"
P	Switchpoint Spread	Maximum	67.69 mm	2.665"

F Gauge Wheel Standards (S4)

K	Check Gauge	Maximum	68.28 mm	2.688"
B	Back to Back of Flanges	Minimum	66.24 mm	2.608"
N	Tire Width	Minimum	6.99 mm	0.275"
D	Flange Depth	Minimum	1.24 mm	0.049"
		Maximum	1.88 mm	0.074"
T	Flange Width	Maximum	1.91 mm	0.075"
W	Tread Width	Minimum	5.08 mm	0.200"

Journal Diameter (for 3/16" Bushing)	4.50 mm	0.177"
Axle Length (Outside Bearing)	106.30 mm	4.185"
Coupler Center Height (Above Railhead)	43.13 mm	1.698"