FamilySearch has connected the page to the “Mormon Pioneer Overland Travel” database of the Church History Department of the Church of Jesus Christ of Latter-day Saints. Click on “Your Pioneer Ancestors” to see a list of your ancestors that FamilySearch found in the database. (It found 22 of mine.)
Click on an Ancestor’s name to jump to him or her in FamilySearch Family Tree. Click on the name of a company to see information about that company, links to journal accounts, and a link to a list of everyone in that company. Click on “Trail Experiences (Stories)” to jump to a page on the Mormon Pioneer Overland Travel website that contains a list of sources and links to journal transcriptions and biographies telling the story of your ancestor and his pioneer company.
The database contains all identified Mormon immigrants who travelled to the Utah territory between 1847 and 1868 (the last year before the railroad made it all the way to Utah). Most travelled the Mormon Trail, which paralleled or coincided with the Oregon-California Trail until Fort Bridger. As I recall, the Oregon-California Trail ran along the South side of the North Platte River and the Mormon Trail ran along the North.
For lists of travellers on the Oregon-California Trail, see the website, Paper Trail: A Guide to Overland Pioneer Names and Documents. (A subscription is required.)