The area became more accessible to tourists in 1913 when the Lincoln Highway, the first road across the United States opened over the Donner Pass. This road was later upgraded in 1926 to U.S. Route 40, although snow plowing operations by the state of California didn't start until 1932, making travel to the area by car difficult in the winter. In 1924 Charlie Chaplin filmed scenes upon Mt. Lincoln for his silent movie classic The Gold Rush. Six hundred men were brought in by train from Sacramento to serve as extras for the comedy scene.