PRR K4 Pacific No. 3750

Pennsylvania Railroad (PRR) No. 3750 is a K4-class 4-6-2 (Pacific) steam engine. It was built by Altoona in 1920 for heavy express passenger trains such as the famous Broadway Limited, and became one of the most famous types of steam engine to wear the Pennsylvania keystone. No. 3750 remained in service until the PRR retired all steam engines in 1957, and was one of two K4 Pacifics to be preserved. It is on display outside the Pennsylvania Railroad Museum in Strasburg.