What are those red lines in the Graph?

What are those red lines in the Graph?

A:

That is the graph of the daily noise we suffer every day in this area. 

Here is one full day. It happens to be Monday 13 November 2017, but it is just like every other day. Each spike in the graph is a train.  The noise level is shown by the graph axis at the side. There is a small gap in the middle of the night, but really, 3 hours sleep is not enough.

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