A long passenger rail tunnel system is proposed in North America. The tunnel system will primarily serve regional electric passenger rail service, but also serve diesel powered commuter rail trains as well as diesel powered commercial freight trains. Diesel locomotives present an especially difficult challenge for tunnel ventilation in that they produce, approximately, three times more heat than electric locomotives, and diesel engine exhaust as a by-product of the traction power generation. The latest version of Subway Ventilation Simulation (SVS) program includes a new train motor model which was used to model the transient heat generation of diesel locomotives as a function of tractive effort required to traverse the tunnel with downhill and uphill tunnel grades. Diesel engine exhaust, consisting of Carbon Monoxide (CO) and Nitrogen Oxides (NO_x), was also modelled in the SVS. The heat and diesel engine exhaust from the locomotives presented a challenge for the traditional tunnel ventilation design. This paper presents a technique to model the heat and diesel engine exhaust generated by diesel locomotives utilizing this new motor model in rail tunnels and the ventilation required to meet constraints for diesel engine and air-conditioning (AC) system operation.
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