The first 30 of Reading class G1sa Pacifics were built at the Reading shops from 1916-1922. The last five of this class were built by Baldwin in 1924. With 40,900 lbs starting te and 80 inch drivers, these were certainly not light Pacifcs. They had a Wootten type firebox, designed for burning an anthracite waste product, "culm", and anthracite coal in general. Similar Pacifics were to be found on the Central New Jersey, the Lehigh Valley the Delaware, Lackawanna & Western

In 1948, Reading Shops built Class G3 (no more "s", just as on the Pennsy)) 210-219. Basically, these were developments of a later version of 124, class G2sa. They had higher boiler pressure, and such details as a Worthington SA feedwater heater and cast steel engine beds. Under the combined onslaught of diesels and the debilitating effect of declining passenger traffic, they were all gone within nine years. One of the places where they worked was on the Pennsylvania- Reading Seashore Line, during the summer rush. Actually, on PRSL runs which served PRR 30th Street, they may well have been the last steam locomotives to haul passenger trains in Philadelphia.