Are you sure? This link indicates the year was indeed 1942. In order for the the tracks that became WAG to be physically connected to the B&O prior to the flood of '42, there would have been at least a connection between Wellsville and the BR&P in Freedom.
The connection between the B&S and BR&P that tied the whole thing to the B&O in 1932 was at Dubois, PA. There was no connection north of Dubois. After the 1942 flood, the remaining northern section of the former B&S was completely detached from the rest of the B&O.
The B&O bought the B&S and the BR&P in 1932 as part of a scheme to built the shortest low-grade route between New York and Chicago. They wanted the B&S from Sinnemahoning to Dubois, and the BR&P from Dubois to Eidenau Jct, to fill in that part of the line. They planned to come out of Jersey City on the CNJ to Nesquehoning Jct and Tamaqua, over the Reading to Newberry Jct, and then either build between Newberry Jct and Sinnemahoning or acquire trackage rights on the PRR. The depression put an end to that plan.