Traffic to the west and south (and later north) of the state brought the need to amplify the line, first in 1891 when it was quadrupled and later in 1927 when it was sextupled (to Homebush) and electrified. With both of these major changes the earlier stations were usually entirely demolished and replaced with a new station. The 1927 work completed this process with the complete replacement of Strathfield and much of Newtown Stations. During this time suburban development also extended west along the line and these new stations were thus specifically designed as full-scale suburban passenger stations rather than rural "halts". The Engineer for Existing Lines, George Cowdery (appointed 1863), was a particularly strong influence on the architecture of this line, building particularly elegant stations in the late 1880s ahead of the 1891 quadruplication, in addition to replacing the original stone arch viaduct at Lewisham with iron truss bridges. Sextuplication in 1927 brought less change to most local stations (which were on the southern side), the new tracks being express ones on the northern side.