San Diego Union-Tribune: Even in a state known for dreaming big, the idea’s a doozy: a train so swift that it could speed from San Diego to San Francisco in a little less than four hours. The idea of building a high-speed rail network in California has been debated, studied, ridiculed, celebrated and studied again for more than a decade. State voters will decide the issue Nov. 4. Proposition 1A asks voters to approve nearly $10 billion in bond sales to spur construction of an 800-mile, …