A bit further down the coast in Fremont is the Niles Canyon Railway. They have some beautiful railroad memorabilia including a Santa Fe Caboose which you can rent and ride in. This is the same type of caboose used for Orient Express, La Loose Caboose, Easy Rider and Wild Wild West. The rental caboose is great for parties of 20 adults or 40 kids.
You can find out more about the caboose rental on the Niles Canyon Railway's web site.
The Niles Canyon Railway runs seasonally, so you should contact them for details.