PURPOSE: To provide a rail capable of reducing the labor and improving the efficiency of the work in a greenhouse by forming a plurality of ridges in a continuous greenhouse provided with plural roofs having circular, barrel or inverted V-shape, etc., and laying a specific number of rails between the ridges at a specific height.

CONSTITUTION: This invention relates to a new facility in a greenhouse capable of reducing labor or automating various works in a greenhouse, e.g. maintenance in the greenhouse, land preparation and harvesting of crops. A plurality of ridges 108 are formed at prescribed distance in a continuous greenhouse provided with plural roofs having circular, barrel or inverted V-shape. Rails 1 of the number equal to the number of the ridges 108 or ±1 of the number of the ridges are laid at nearly the middle part between the ridges. The height of the rail 1 is fixed to be same as or higher than the height H of the ridge 108 to reduce the labor of the work in a greenhouse and further improve the work efficiency.