High Quality Content by WIKIPEDIA articles! The Utah Division of the former Denver and Rio Grande Western Railroad (D&RGW) is a rail line that connects Grand Junction, Colorado and Salt Lake City, Utah (formerly Ogden) in the Western United States. It is now incorporated into the Union Pacific Railroad (UP) system as its Green River and Provo Subdivisions, forming a portion of the Denver-Nevada Central Corridor. Daily passenger service is provided by Amtrak`s California Zephyr, and the BNSF Railway and Utah Railway have trackage rights over the line.