a river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River

Allegheny is a SEPTA Regional Rail station located along the R6 Norristown line located at 22nd Street and Allegheny Avenue in the Swampoodle neighborhood of North Philadelphia. http://www.septa.org/maps/click_map/allegheny.html SEPTA. "Allegheny Station." Allegheny Station is the first station along SEPTA's R6 Norristown line not to be shared with any other line.

Locomotive with 2-6-6-6 wheel arrangement (refer Whyte)

Of or pertaining to the Allegheny Mountains, or the region where they are situated. Also Alleghany.