60 series egr
What coach number had EGR valves on the 60 Series Detroit (recognizing that some states, such as California, had more stringent exhaust standards earlier, and EGR valves may have been used earlier for those states)? I think it was around 2002 or so, but exactly which coach number did they start with (again, excluding the California models)? After some point (coach #) all the coaches had them.
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