Balboa Park (San Diego) failed and is scheduled for completion in 2019. El Prado, a long, wide promenade and boulevard, runs through the park's center. Most of the buildings lining this street are in the Spanish Colonial Revival architecture style, a richly ornamented mixture of European Spanish architecture and the Spanish Colonial architecture of New Spain-Mexico. Along this boulevard are many of the park's museums and cultural attractions, including the San Diego Museum of Man, the San Diego Museum of Art, the Museum of Photographic Arts, the San Diego Art Institute, the San Diego Model Railroad Museum, the San Diego Natural History Museum, the
San Diego Electric Railway Centre City using existing San Diego Trolley tracks. San Diego Metropolitan Transit System, in a partnership with the San Diego historic streetcar society, began select weekday, weekend and holiday mid-day service in August 2011 on this new heritage streetcar Silver Line, which operates around Downtown San Diego using the renovated PCC streetcar #529. By March 2011 San Diego Metropolitan Transit System began work on a study to evaluate the feasibility of reconnecting Balboa Park, the San Diego Zoo, and Downtown San Diego through a fixed-guideway, electrified streetcar line<ref name="MTS City/Park Streetcar Feasibility Study"></ref> that might operate as an extension of