The 1624 is an electric locomotive which hauled freight trains throughout PE’s extensive system. Although primarily remembered as a passenger carrier, the Pacific Electric did an extensive freight-hauling business in Southern California for the first half of the twentieth century. PE built the 1624 and twelve other identical locomotives in its own shops in 1924-25. The locomotives were patterned after the predecessor 1601 class, built by Baldwin-Westinghouse.

The 1624 was used regularly on the Museum Railway into the 1980s. After suffering from air compressor problems, failing roof boards under its trolley pole, and general exposure to the elements, it was out of service from about 1995-2005. In 2005, its roof was reassembled and rewired (the trolley boards had been replaced some years before). In 2006, the locomotive returned to limited service, and once again appears on the Museum Railway during special events.  When Carhouse Seven is complete, the 1624 (along with a great many other cars and locomotives) will finally have an indoor home.