The San Juan Express (also known as simply the San Juan) was a narrow gauge train that ran on the 3 feet (0.91 m) Denver & Rio Grande Western Railroad (D&RGW) route from Durango, Colorado via Chama, New Mexico; Cumbres Pass; and Antonito, Colorado to Alamosa, Colorado. The train ran from February 11, 1937 until January 31, 1951 as train numbers 115 and 116. Normally, the train would be 4 cars long, which consisted of a Railway Post Office Car, or RPO for short, a Baggage Car,a a Passenger Car, and a Parlor Car. But there is photographic evidence of the train having as many as 8 cars.