Just on the other side of the PCH, there are train tracks where trains run regularly. There is the Coaster, which is the commuter train that runs from Orange Country to San Diego. There is the Amtrak train. And there are regular Freight Trains.
A train ran those tracks at least once an hour. The Coaster ran through once an hour from 5:30am to 9:30pm on Thursday and Friday. And then it's run was less on Saturday and Sunday, but you still had the Amtrak and Freight Train running.
There was an obvious reduction in how many trains were running through the night on Friday and through the day on Saturday, and even fewer through the night on Saturday. But when they did run, they were loud!
Here is a video of just how loud. And Yes, that is our tent.