What problems did trapped exhaust cause in the Cascade Tunnel?

I think it was carbon monoxide "the silent killer"

Explanation:

Answer

hot locomotive cars

cold passenger cars

carbon-monoxide poisoning

slippery, soot-covered tracks

frequent fires onboard the train

loss of consciousness and death

to save the day, harry must get past a scary three-headed guard dog.

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hope this , and have a good day. c;