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[quote user="SeeYou190"]Ummm... MODERN diesel engines absolutely DO NOT ever emit sparks. This spark would need to get past the Catalyst Soot Filter (CSF or DPF), and the Selective Reductant Catalyst (SRC or SCR) before being expelled from the exhaust. This should be impossible unless multiple components are compromised.[/quote] Probably wont be seeing sparks coming from a tier 4 compliant locomotive. [quote user="SeeYou190"]Even with a turbocharger, solid partially burned material could get through the combustion cycle and make it into the exhaust where they would ignite when reaching oxygen in the atmosphere, but this would be very rare.[/quote] It happens quite a lot to GEs (google GE locomotive turbo fire).   also some explanation here: <a>http://cs.trains.com/trn/f/741/p/254895/2850268.aspx</a> A little column A, a little column B.
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