BOSTON, MASSACHUSETTS: Interior of an MTA "T" subway trolley-train on the D Riverside line Stock Photo - Alamy
File:R33S subway car at Seashore Trolley Museum, May 2010.jpg - Wikimedia Commons
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/cdn.vox-cdn.com/uploads/chorus_image/image/56806517/2341869113_c5c2fbd698_o.0.jpg "Philly's best bus, subway, and trolley routes - Curbed Philly")
Philly's best bus, subway, and trolley routes - Curbed Philly
File:SEPTA Subway-Surface map.png - Wikipedia
File:R4 subway car at Seashore Trolley Museum, June 2007.jpg - Wikipedia
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/cloudfront-us-east-1.images.arcpublishing.com/pmn/ZAGB5URMT5FC7AUXR2FAC4C5EQ.jpg "New SEPTA trolleys approved for up to $863 milion")
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SEPTA subway–surface trolley lines - Wikipedia
U.S. Streetcar Systems- Pennsylvania
Subway–Surface Trolley Lines in Philadelphia 2022 - YouTube
SEPTA Subway–Surface Trolley Lines in Philadelphia - YouTube
