2-2-0 "Planet" Type Locomotives

This was an inversion of the Rocket type (0-2-2). Its name comes from the name of the first example in 1830: Robert Stephenson's Planet.

No.	Class	F.M. Whyte	Gauge	Railroad Line	Location	Status	Builder Information	Notes
		2-2-0	4'-8½"	B&O	B&O Railroad Museum, Baltimore, MD	operational	B&O (Mt. Clare), 1927	Named Tom Thumb, replica