Question: The Las Vegas and Tonopah Railroad was a 197.9 mile railroad.that ran northwest from a connection with the mainline of the San Pedro, Los Angeles and Salt Lake Railroad at Las Vegas, Nevada, the SPLA&SL railroad later became part of which freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans?
{'answer': 'Union Pacific Railroad', 'supporting_facts': [['Las Vegas and Tonopah Railroad', 1], ['Union Pacific Railroad', 0]]}