THEN: On Jan. 1, 1947, a streetcar travels the Guilford Avenue Elevated line. The streetcar-only trestle extended from Saratoga to Biddle streets from the 1890s to 1950. (Leroy B. Merriken, Baltimore Sun photo 1947)

NOW: On Feb. 12, 2015, traffic moves south along Guilford Avenue as seen from the Orleans Street Viaduct. (Jerry Jackson, Baltimore Sun photo, 2015)

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Days of transportation past. Click the Read More link above to get to the cool slider functionality on the blog that allows you to overlay the photos.