The Beylik Family Farm in Fillmore grows tomatoes and cucumbers hydroponically. They also have heirloom tomatoes and peppers which are field grown. They sell exclusively at Farmers' Markets. We visited them at their annual open house last weekend.
Above is a row of young tomato plants. As the vines grow longer the strings are extended, and the vines are clipped onto them. The "rails" down the center of the row are heating pipes, used in the winter. They also serve to carry an electric cart that can be used to harvest tomatoes or to maintain the strings.
Here are mature vines with tomatoes ready for picking. These vines are 20-30' in length at this point.
Here are finished tomatoes ready for sale. Not your everyday supermarket product!