The San Diego Class 1 streetcar was a fleet of twenty-four unique streetcars that were originally built to provide transportation for the Panama-California Exposition in Balboa Park. The cars were designed by the San Diego Electric Railway Company (SDERy) under the leadership of John D. Spreckels and built by the St. Louis Car Company (SLCCo). These cars, which took the best elements from preceding models and integrated them into a new, modern streetcar design, went on to serve the many neighborhoods of San Diego until they were retired in 1939. While most of them were ultimately destroyed over the years, three remaining Class 1 streetcars are preserved and are in storage. History The Panama-California Exposition and the inception of the Class 1 streetcars To celebrate the opening of the Panama Canal and to advertise San Diego as a vital port destination for traveling ships, city leaders planned the Panama-California Exposition of 1915. It was decided it would take place in Balboa Park, which was largely an open space park up until that point and would have to undergo major renovations and construction to be made ready for the event. Visionary artists and developers from San Diego and throughout America came together to design and construct an impressive new park. Apart from the architectural and botanical transformations that took place in Balboa Park, John D. Spreckels and his San Diego Electric Railway Company (SDERy) took on the task of providing public transportation for the Exposition. Directing a team of engineers and designers led by Abel A. Butterworth, Spreckels and SDERy Vice President, William Clayton, sought to develop a new streetcar that could both provide transportation for the visitors at the Panama-California Exposition and for the city of San Diego in the following decades of anticipated growth. One of the main goals for Spreckels and San Diego Electric Railway was improving upon the flaws of existing streetcars, all the while synthesizing their strengths. Taking notes from both the “California Car” and “Closed Car” models, Butterworth and his team successfully developed an updated, modern streetcar with improved safety, speed, technology, and overall design. These new cars, known as the Class 1s, were also designed in the Arts & Crafts style with an artist’s touch to complement the changes to Balboa Park. Built by the world-renowned Saint Louis Car Company, they were adorned with warm yellow colors, gold-leafed oak leaves, hand-polished cherry wood, and