Before the Key System started using the Bay Bridge, Line B was called the 22nd Street line. It originally terminated at the Key Route Inn at Grand and Broadway. It was later extended to down Grand Avenue to the Trestle Glen neighborhood to develop the property there.
Many remnants of Line B still exist today. First of all, AC Transit still operates the Line B bus. Second, if you walk up Trestle Glen Road from Lakeshore towards Grovesnor, look at the backyards of the houses on the left. You will be able to see the graded right of way and the old line poles that held the electric wire for the trains. Second, at the corner of Trestle Glen and Lakeshore, take a look at the modern bank building and notice its curved shape. The building is curved because it was built the Line B right of way where the tracks curved off of Lakeshore into Trestle Glen. If you visit the parking lot on the Longridge side of the building, you can get a close look at one of the many remaining trolley poles along the right of way.