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[quote user="beaulieu"] You will see similar issues with US diesels after slow full throttle running in longer tunnels, the diesel engine starts to use up the available oxygen. Now I am not saying that the tunnel shown is nearly as long as the Moffat tunnel, but even a one mile long tunnel will produce that effect, especially if it is on a grade. <div style="clear:both;"></div> [/quote] Here is something for comparison.  Tunnels pose problems with providing enough oxygen for the engines.  Engines are set to burn a certain amount of fuel per the oxygen they inhale.  If you starve them for oxygen, they will be fuel-rich, and make smoke.   <a href="http://www.youtube.com/watch?v=v-ECBxoJqYE">http://www.youtube.com/watch?v=v-ECBxoJqYE</a>
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