I was looking through American Locomotives 1900-1950 by Edwin Alexander (c. 1950) and came across a locomotive that defines an odd-duck, the Union Railroad's 0-10-2s first built in 1936 by Baldwin. The Union served Pittsburgh's steel mills and needed heavy switching power. Shop and turntable restrictions limited length, so the front truck was jettisoned, but the rear truck retained to support the large firebox. Note too that a tender booster was included in the design. These were known as Unions and they were the only examples built. My Dad gave me the book when I was nine and he educated me in wheel arrangements that same evening. It hardly seems so long ago.