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What do you do if some incident halts full trains (possibly depowering them but for things like emergency lighting) near the midpoints of longer sections of 40 degC deep tunnels?

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You can survive a few hours at that temperature, so not an immediate catastrophe. You should be still able (though not comfortable) to walk to the next emergency exit or station.

how many times has this scenario happened in last 20 years?

This is exactly the kind of thinking that lead to https://en.wikipedia.org/wiki/King%27s_Cross_fire

In safety engineering you do have to think about low-probability events.

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