After watching the Atlas engine startup, I recall the Taconite, when she was active in Vancouver, as having a pair of Atlas Air start, direct drive engines.
Watching her maneuver into a dock was always a treat. dead slow fwd, stop engines, restart in reverse for only a very few revolutions, stop again, restart in fwd or reverse, as needed, drift towards the dock. Repeat as necessary.
In each of those starts, the puffs of exhaust were separated, so appeared as individual smoke signals.
I last saw Taconite a few yrs after she was sold out of Vancouver and was based in Maple Bay, no shelter, little maintenance, so was starting to look neglected, then sold and gone away in about 2018 or 2019. Anyone seen her since then?
https://classicyacht.org/boats/taconite