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 the Anthracite locus. This darkens the body colour to a shade somewhat deeper than a Dark Green. The DF Anthracite Light Green, with two Anthracite alleles, is a deep olive colour. In the blue series varieties the SF Anthracite Skyblue has one Anthracite allele and one wild-type allele, with a body colour rather like a deep Cobalt. The DF Anthracite Skyblue with two Anthracite alleles, the true Anthracite variety, has a dark grey, almost black, body colour with mauve overtones. Because the Anthracite factor is always visibly expressed no budgerigar can be split for Anthracite. The heterozygotes of Anthracite with