The decades-long effort to advance the design and technology of steam locomotives constantly circled back to the idea of "make it bigger." Articulated engines took that notion and doubled it both ...

PRR K4 Loco Add-On The PRR K4 steam locomotive is a true American classic, and is the ideal companion to our Horseshoe Curve Expansion Pack which captures the glory days. Advertisement All the ...

30-year restoration of Pennsylvania’s “official” steam locomotive, the Altoona-built K4 1361. “Someone very unlikely came to the table to help us,” Railroaders Memorial Museum Executive ...