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EIGHT N scale EMD exhaust silencer hatches. Commonly seen on Conrail, NS, CN, CP, and Santa Fe units.
Simply soak in Bestine overnight, clean off residue and paint to match model. A 9mm section between the dynamic brake fans and the inertial air filter will need to be filed flat on the bodyshell to mount the exhaust silencer hatch in place over the existing exhaust stack.