Yes, there are several passenger train services in the US besides Amtrak. They fall into a few distinct categories:
These are routes funded by state or regional authorities. Amtrak typically operates the trains and staffs them, but the service exists because of local investment. They are branded as Amtrak but are distinct from its national network. Examples: California’s Capitol Corridor (San Jose-Sacramento-Auburn), Pacific Surfliner (San Diego-Los Angeles-San Luis Obispo), and San Joaquins (Oakland/Bay Area-Sacramento-Bakersfield). Others include Amtrak Cascades (Oregon-Washington-British Columbia), Empire Service (New York City-Albany-Buffalo-Niagara), Hiawatha Service (Chicago-Milwaukee), and Downeaster (Boston-Portland, ME).
These are suburban rail services focused on getting people in and out of major metropolitan areas during peak commute times. They are completely separate from Amtrak. Major Examples: Metra (Chicago and northeastern Illinois) Metro-North Railroad (New York City to Upstate NY and Connecticut) Long Island Rail Road (LIRR) (New York City to Long Island) NJ Transit Rail Operations (New Jersey and into New York/Pennsylvania) SEPTA Regional Rail (Philadelphia and surrounding