Which a quote you had earlier says is seventy feet long for a five-hundred year old dragon, twenty feet for a youngish one. Even with proportionately fairly narrow bodies I think it's going to have to be a fairly broad gauge, whether tunnels, embankments and cuttings are more expensive than narrow ones would be or not. Things like slate and coal mines might use a narrower gauge and be manned dragonned by smaller crew who put up with being crowded though.
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Which a quote you had earlier says is seventy feet long for a five-hundred year old dragon, twenty feet for a youngish one.
Even with proportionately fairly narrow bodies I think it's going to have to be a fairly broad gauge, whether tunnels, embankments and cuttings are more expensive than narrow ones would be or not. Things like slate and coal mines might use a narrower gauge and be
manneddragonned by smaller crew who put up with being crowded though.