From the point where that river empties itself into the estuary of the Yangtsze-kiang.
Large numbers of eastbound coal trains from the mountains and westbound "empties" returning to the mines stop here; and the cars of these trains are classified here and new trains made up. Locomotives and cars are sent to Altoona to be repaired from all over the Pennsylvania railway system E.
The largest is that of the Tuira (formerly called Rio Darien), whose headwaters are near the Caribbean and which empties into the Pacific in the Gulf of San Miguel.
North of the junction is Bull Run, a small stream which empties into the Occoquan, an arm of the Potomac. In this neighbourhood two important battles of the American Civil War, the first and second battles of Bull Run, were fought on the 21st of July 1861 and on the 29th-30th of August 1862 respectively; by Southern historians these battles are called the battles of Manassas.
Other portions of the state are drained by the Kankakee, a tributary of the Illinois, the St Joseph and its principal branch, the Elkhart, which flow north through the south-west corner of Michigan and empty into Lake Michigan; the St Mary's and another St Joseph, whose confluence forms the Maumee, which empties into Lake Erie; and the White Water, which drains a considerable portion of the south-west part of the state into the Ohio.