The Monongahela Incline, the oldest continuously operating funicular railway in the United States, began service in 1870 to carry factory and mill workers from their homes atop Mount Washington to their workplaces. As electric streetcars were introduced and the Liberty Bridge and Tunnel and P.J. McArdle Roadway were built in the early 20th century, ridership declined, and the Port Authority of Allegheny County later purchased the incline while consolidating the region's public transit. Today it remains an essential link for downtown Pittsburgh commuters and visitors from around the world. Caroline Endres, one of the first female engineers in the country, oversaw its construction; her father, John J. Endres, designed it with the help of John Roebling. Caroline later married Samuel Dlescher, an engineer who built or rebuilt ten Pittsburgh inclines, including the Duquesne Incline, the city's only other remaining incline, also in Mount Washington. Shiloh Street nearby is a business district of shops and eateries and is also associated with the ghost of Mrs. Katherine Soffel, the wife of a prison warden who broke the Biddle brothers out of jail in 1902 and was later portrayed in the 1984 film "Mrs. Soffel."