Just in case someone hasn't seen this - traction engines as well as a paddler
https://www.youtube.com/watch?v=JAb1J3R4eNM

and another viewpoint
https://www.youtube.com/watch?v=iC16rpdyVHM

Very interesting....best to watch the second video first.........wasn't sure what the engine at the stern end was doing?....possibly just as an anchor and also to square up if needed?......with the engine at midships doing the hauling in via a wire loop on the cradle?..........

Thanks for sharing........ Derek