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What (who) is YFD-2 - definition
YFD-2
 in half-sunken YFD-2 at Pearl Harbor.jpg?width=200 "USS ''Shaw'' in half-sunken YFD-2 at Pearl Harbor")
 in sunken YFD-2 after Pearl Harbor attack.jpg?width=200 "USS ''Shaw'' in sunken YFD-2 after Pearl Harbor attack")
UNITED STATES NAVY DRYDOCK
Yard Floating Dry Dock YFD-2; USS YFD-2; USS YFD-2 (YFD-2)
YFD-2 (Yard Floating Dock-2, USS YFD-2) was an auxiliary floating drydock built for the United States Navy in 1901. The first parts were laid down in early 1901 at Maryland Steel Co.
2-2-2-2
![Greater Britain]]''](https://commons.wikimedia.org/wiki/Special:FilePath/LNWR engine No.2053 'Greater Britain'.jpg?width=200 "Greater Britain]]''")
![LNWR ''John Hick'' Class, engine <br> No. 1535 ''[[Henry Maudslay]]''](https://commons.wikimedia.org/wiki/Special:FilePath/LNWR engine No. 1535 Henry Maudslay.jpg?width=200 "LNWR ''John Hick'' Class, engine <br> No. 1535 ''[[Henry Maudslay]]''")
LOCOMOTIVE WHEEL ARRANGEMENT
2-(2-2)-2; 2-2-2-2T
Under the Whyte notation for the classification of steam locomotives, 2-2-2-2 could represent either the wheel arrangement of two leading wheels, four powered but uncoupled driving wheels, and two trailing wheels; or of two independent leading axles (not in a bogie truck), two driving wheels, and two trailing wheels.
2-2-2-0
LOCOMOTIVE WHEEL ARRANGEMENT
2-(2-2)-0
Under the Whyte notation for the classification of steam locomotives, 2-2-2-0 usually represents the wheel arrangement of two leading wheels on one axle, four powered but uncoupled driving wheels on two axles, and no trailing wheels, but can also be used to represent two sets of leading wheels (not in a bogie truck) two driving wheels, and no trailing wheels. Some authorities place brackets around the duplicated but uncoupled wheels, creating a notation 2-(2-2)-0, or (2-2)-2-0,Baxter, pp.
