The Feed Station is an item added by Railcraft. The Feed Station, while not directly related to minecarts, enables the creation of automated cattle farms. It can breed cows, pigs, sheep, chickens, wolves, and ocelots.
When provided with wheat, seeds, meat, or any other feed (dependent on animal type), either via the GUI, Loader, or adjacent chest, it will periodically feed a nearby animal. The frequency is random and every feed item will feed two animals. Additionally, the Feed Station will only feed animals ready to mate. As a bonus, pigs, chickens, wolves, and cats will even birth entire litters of offspring, greatly boosting your farm output.
Animals require a certain amount of space to breed, however. Pack them too tight and they won't breed, and in fact may even start despawning if they are packed tightly enough. Providing a Redstone current to the Feed Station will disable it. The Feed Station can cover a 5x5 area if placed in the middle.