This is a really old video but I found it really cool. The coolest, most helpful feature according to me was the use of gravity like pushbacks to exactly connect the end points. I haven't heard of something like that before this.

Had to watch the full video; I had no idea such an advanced feature was made so early. Very innovative for the time.

Definitely extremely cool technology at the time. For others that have not seen this video yet, check it out here!