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Wait … the title mentions engineers. How did a god get in there now?
You know … because as opposed to gods we actually **do have evidence** engineers not only exist but also get stuff done.
Anyway — more importantly the analogy is wrong. It’s bad advice: If somebody is afraid of something (here: trains and tunnels) it’s generally best to research background information and gain more knowledge. Very often fear is irrational and stems from the lack of understanding of how stuff works.
Lack of understanding and the resulting irrational fear is one of the roots of most religions after all.
So a better advice is: Learn how a train (or a tunnel) works, read about train related statistics, talk to an engineer, learn about their education — generally dig as deep into the given subject as necessary to accumulate as much information as possible to feel comfortable with a rational decision. And to make that irrational fear go away.
*Edit: Just notice that I should have replied to dstolman as (s)he mentioned a god.*