This photo appears to me to be of the P&LE yard during the widening of the Smithfield Street Bridge in 1911 and taken from the bridge looking towards Carson St. See the map at
A portion of the yard is perpendicular to the river. On the map the Smithfield Street bridge is marked as the Monongahela Suspension Bridge. The south sidewalk is to the right of the bridge on the map.
The B&O Try Street yard was beneath the PRR Panhandle bridge,