Abstract: A roll-up crowd gate comprises an electrically charged drum that is rotatable in a carriage. Long cables connected to the drum are also electrically charged. A rope translates the carriage in tracks between upstream and downstream locations. Translation of the carriage in the downstream direction when the cables are unrolled from the drum urges a first herd of cows to the downstream location. Carriage stops in the tracks stop carriage translation at the downstream location, but continued operation of the rope when the carriage is against the stop causes the drum to roll up the cables. Reverse operation of the rope translates the carriage above the first herd to the upstream location. A carriage stop at the upstream location stops carriage translation, but continued operation of the rope rotates the drum and unrolls the cables behind a second herd of cows.