Wild runaway physics
I imagine others have noticed this but I couldn't find a similar bug. This game often has physics issues that cause creations to fly about wildly. Attached images show my rock elevator bouncing about like a fish on a line and the rope drum axle coming loose after a few bounces. This often results in my rock cart exploding into component pieces. This also occurs with horizontal carts on occasion.
For reproduction; this occurs most often with higher weight. Empty carts are less likely to begin moving wildly but they still can.