D (Los Angeles Railway)

Bonnie Brae Line (1895-1920)

During the early days of LARy, the route ("Bonnie Brae") had to compete with multiple other streetcar companies, running a circuitous route to avoid them between Central Station and the northern portion of Westlake, by way of 5th Street, Olive Street, 6th Street, Figueroa Street, 7th Street Alvarado Street, Webster Avenue, and Bonnie Brae Street.

Following the Great Merger of 1911, Pacific Electric divested most of its Los Angeles local routes to LARy, allowing D to use former LAIU trackage on West 6th street Westlake. The Figueroa and 7th street portions of the line were eliminated, shortening the trip by a quarter of a mile. In 1920, the Bonnie Brae Line was renamed D.

D Line (1920-1947)

Early in the 1920s, the 5th street segment was extended so that 3, U, and D lines could run straight along 5th street through Downtown and shortening the route by an additional quarter mile. Unfortunately, this made D little more than a branch of two much more popular routes, with the closure of Central Station in 1940, and no major destinations on East 5th Street, ridership downtown reduced significantly. At the same time, however, the removal of the I line improved ridership in Westlake. The route was removed by Los Angeles Transit Lines in 1947.