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The exhaust steam can be condensed, and the South African Railways sure proved that, inspire of the increased maintenance associated with the design. However, with an external combustion process, no mater whether coal or oil is burned, there will ALWAYS be exhaust gases & smoke. There is no way around that combustion process.
That's what I thought. In a tunnel environment, though (I'm thinking about engines like the Metropolitan Class A 4-4-0T or the GNR/LNER Class N2 0-6-2T), I'm having a hard time understanding what good the condensers did when it was the fire exhaust that was the big health hazard, which, as you stated, are ever present with steam locos.
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