https://www.facebook.com/BronxThirdAveEl/photos/a.535024013314350/434829996667086
This might help...a photo of the Bergen Ave cutoff looking north from Third Avenue and up Westchester Ave
To the right, a train coming out of the 149th st & Third Ave station on the 7th Ave/WPR 241st line. The upper level would connect to the 3rd Ave El at 149 th street.