A hypothetical question

Just a thought exercise. Assume that it is after the Covid peril has been defeated and on a fine Summer day a double-header leaves Chama with a full load of happy tourists. The question is: Which activity created more air pollution (exclusive of CO2), the ride f our tourist up the hill to osier & back, or them driving their cars to Chama the previous day? (note: for the purposes of simplicity, assume all passengers drove to Chama and none took the bus from Ant.) (assume, lets say 2.5 people per car on average.)

Anybody want to crunch the numbers? My bet is that the Horseless Carriages, in total, were worse polluters.

Hank

PS, yeah, I like coal for steam engines & see no reason tourist lines should stop using it. At least no real reason, not enough pollution to matter.