Pennsylvania Railroad No 1223 is a D16sb class 4-4-0 built in 1905 by the Altoona Works. This engine is the only preserved class D16sb. The 1223 was home built by the railroad at its Juniata Shops in Altoona, PA, in 1905. No 1223 was later rebuilt with smaller driving wheels for local freight service, having been replaced on passenger trains by engines like the E6 Atlantics and K4 Pacifics. In 1965 locomotive No 1223 was donated to the Strasburg Railroad in Strasburg, Pennsylvania. By the 1970s and 1980s, the 1223 pulled the Strasburg's regular tourist trains. In 1985-1986, No 1223 doubleheaded with PRR No. 7002 pulling excursions for the Strasburg Railroad. In 1989, Strasburg's newly acquired ultrasound device revealed that the firebox walls of both 1223 and 7002 were not thick enough to comply with the updated Federal Railroad Administration regulations, thus deeming the engines unsafe for operation. The locomotive was retired from excursion service the following year, along with 7002. It is now on static display at the Railroad Museum of Pennsylvania, which has taken a firmer stance against loaning equipment to the Strasburg Railroad for excursion service citing the risk of damage.
- This engine was featured in 2 films such as "Broadway Limited" (1941), and Hello, Dolly (1969).
- 1223 pulled a variety of special trains throughout its excursion career:
- The engine pulled a Santa Claus Special at Lancaster, PA in December 1966.
- In September of 1982, she pulled the Pennsylvania Special.
- In 1978 it was seen on a double-header with Canadian National No. 89.
- In 1988 the engine pulled the Nylon Express in Felton, Delaware.
- On June 4th, 2010 it was 'steamed up' using an oily rag, even though it has always been on static display.