History of anthracite coal mining in Pennsylvania competition with the Schuylkill Navigation Company, until the Reading Railroad eventually leased out the Schuylkill Navigation Company in 1870. The Delaware, Lackawanna & Western Railroad would become the major carrier of anthracite from the northern fields to NYC (Dublin, Licht, 15-17). While the extensive railroad systems made transporting more efficient, they also lowered the price of coal in distant markets such as Philadelphia and NYC relative to the prices in areas surrounding the mines. In 1840 the wholesale price of anthracite in Philadelphia relative to the mine price was 3.6, and by 1864 the ratio was 1.3. A similar drop
Anthracite budgerigar mutation now be determined. It seems likely that the Anthracite is the re-emergence of the English Grey. A bird with two Anthracite factors has an extremely dark grey body, jet black markings and the cheek patches of the same very dark grey as the body. G W von Kamrath describes them as "jet black wing and tail markings and deep black cheek patches". A single Anthracite factor has a similar effect to the Dark mutation, causing a Skyblue to become Cobalt in appearance. The Anthracite mutation appeared in Germany in 1998 in the aviaries of Hans-Jürgen H Lenk, who successfully established