CIT Group/Capital Finance, Inc's GP20D is a four-axle B-B (two identical trucks) switcher built by MotivePower Industries and Electro-Motive Diesel. Only 40 units have been produced by EMD, all of which were manufactured during June 2000.
""The world is full of obvious things which nobody by any chance ever observes…""
— Arthur Conan Doyle
“The Hound of the Baskervilles”
""Mathematics...
http://en.wikipedia.org/wiki/EMD_GP20D