Dr. James E. Fulton came to the area as an agent for the San Gertrudes Land Company in 1871. He found, when drilling a well, a sulfur spring, and developed it by 1874 into a health spa with a small hotel in the area around what today would be Heritage Park. It included a windmill to draw water into the pool for bathers. In the beginning he had about 400 patients there annually. Later, in 1886, the Atchison, Topeka & Santa Fe Railway purchased land from Fulton to run the train line from Los Angeles to San Diego, changing the town since now there was rail transportation.