Transit matters in Sunnyside. One public transit line was the impetus for the founding of the neighborhood, the San Francisco and San Mateo Electric Railway. A Southern Pacific steam train barreled along the edge of the district until the 1940s. In the 1960s the I-280 freeway has forever changed the neighborhood. Here are some posts.

X1912-SFMTA-U03390-bus-rider-SS-Crossing-detail
Photo courtesy SFMTA sfmta.photoshelter.org

Related: Here is an account elsewhere of the San Francisco and San Jose Railroad (Southern Pacific), the steam train that went through the Mission and along the eastern edge of Sunnyside: http://www.nesssoftware.com/www/sf/sfsjrr.php