The Prussian Class G 4 were German, six-coupled, goods train, steam locomotives with a boiler pressure of 12 bar, built primarily for the Prussian state railways. Classified by the state railway in 1905, they included 16 locomotives from the railway division of Mainz, that originally came from the Hessian Ludwigsbahn. These earlier locomotives were delivered between 1872 and 1896 and did not meet the Prussian norms. The Lübeck-Büchen Railway (LBE) also owned two locomotives of this class, built in 1892 and 1893, but they classified them as G 3s and had retired them by 1923.