Mission San Gabriel Arcángel, fourth in the Alta California chain, was founded in 1771 near what would one day be the City of Los Angeles. Thirty-three years later the mission would unknowingly witness the origin of the California citrus industry with the planting of the region's first significant orchard, though the commercial potential of citrus would not be realized until 1841. Several small carloads of California crops were shipped eastward via the new transcontinental route almost immediately after its completion, using a special type of ventilated boxcar modified specifically for this purpose. The advent of the iced refrigerator car or "reefer" led to increases in both the amount of product carried and in the distances traveled.