In 1914, the PRR experimentally rebuilt D16b #178 in the Altoona Shops, giving it a superheater for greater power and efficiency. This necessitated replacing the slide-valve equipped cylinders, the lubrication of which was incompatible with the hotter, dryer superheated steam, with piston valves and slightly larger cylinders.

In 1914, the PRR experimentally rebuilt D16b #178 in the Altoona Shops, giving it a superheater for greater power and efficiency. This necessitated replacing the slide-valve equipped cylinders, the lubrication of which was incompatible with the hotter, dryer superheated steam, with piston valves and slightly larger cylinders.

Several D16b locomotives were built by the PRR in 1905 and 1906 for their subsidiary the Long Island Railroad (LIRR). The D16b had the traditional PRR squared-off firebox which originally had a rounded edge to the smokebox and the cylinder box was square. When superheated, they were re-classed D16sb.

After the Class L/D16 entered production in 1895 (Locobase 1144), its impact on PRR passenger trains led to subclasses of 80"-driver express locomotives: D16a (Locobase 2833) and D16c/D16d (Locobase 13221.) But the biggest subclass was the 68" D16b produced from 1900 to 1908.

The major difference of the D16b, D16c and D16d subclasses when compared to the D16 and D16a, were their rear-sloping fireboxes which significantly increased the heating surface area allowing for...

2024年10月2日 · Class D16 on the Pennsylvania Railroad was their final development of the 4-4-0 "American" type of steam locomotive. A total of 429 of these locomotives were built, spread across five subclasses; some had 80 in (2,030 mm) diameter driving wheels for service in level territory, while others had 68 in (1,730 mm) drivers for mountainous terrain.

From 1914, PRR installed superheaters in two hundred and forty-one D16 locomotives, along with piston valves, increasing tractive effort. The 68" drivered locomotives were designated D16sb, and the 80" drivered D16sd (the "s" stood for superheated).

LIRR D16b locomotives were built by the PRR in 1905 and 1906 and had 68" drivers. The D16sb which was the same class locomotive after superheating conversion and had additional changes made. The D16b had the traditional PRR squared-off firebox.

Pennsylvania Railroad No 1223 is a D16sb class 4-4-0 built in November 1905 by the Pennsylvania Railroad's Juniata Shops in Altoona, PA. This engine is the only preserved class D16sb. 1223 was originally built as a D16b. Between 1914 and 1920, 1223 was rebuilt with a superheater and was reclassified as a D16sb.