The number in the bottom left corner of this post card is H-2066. That gave me a hint that this might be a Fred Harvey post card printed by a third party. The name of the copyright holder in the bottom right corner confirmed that it was, indeed, a Fred Harvey post card.
Fred Harvey was also a postcard publisher, touted as "the best way to promote your Hotel or Restaurant." Most postcards were published in co-operation with the Detroit Publishing Company.
The title of the post card is “CAJON PASS AT THE SUMMIT OF THE COAST RANGE, CALIFORNIA” Cajon Pass is a mountain pass between the San Bernardino Mountains and the San Gabriel Mountains in Southern California in the United States. It was created by the movements of the San Andreas Fault. In 1851, a group of Mormon settlers led by Amasa M. Lyman and Charles C. Rich traveled through the Cajon Pass in covered wagons on their way from Salt Lake City to southern California.
The California Southern Railroad, a subsidiary of the Atchison, Topeka and Santa Fe Railway, was the first railroad to use the Cajon Pass as a route through the mountains. The rail line through the pass was built in the early 1880s as part of a connection between the present day cities of Barstow and San Diego. Today the Union Pacific Railroad and BNSF Railway (the successor to the Santa Fe) use the pass to reach Los Angeles and San Bernardino. Due to the many trains, noteworthy scenery and easy access, it is a popular location for railfans, and numerous photographs of trains on Cajon Pass appear in books and magazines about trains. The current Amtrak Chicago-Los Angeles Southwest Chief passenger train travels through the pass.
The fact that is was printed by the Detroit Publishing not the Detroit Photographic Company tells us that this card is from after 1904; but, the white border tells us that it is from after 1915. Unfortunately, someone removed the stamp, which took the year of the cancellation with it.