I want to know the answer to the following question:
Where do the Amtrak and Coaster trains primarily run?
All the background I'm provided with is that "San Diego is served by the San Diego Trolley light rail system, by the SDMTS bus system, and by Coaster and Amtrak Pacific Surfliner commuter rail; northern San Diego county is also served by the Sprinter light rail line.". Is that enough to answer the question?