The common Goliath/ Gantry Crane design has been typically used in outdoor applications because it is very effective for projects where there is no current runway structure or building.
Now a days it is just as familiar to see gantries being used for indoor applications as well because of a few essential factors.
There are a seemingly increased number of long buildings that are built with spans that are not supported. These types of buildings offer a more open layout and they also have a less congested floor area; therefore allowing the gantry crane to operate directly on the facility floor as both an economical and practical material handling solution. When using a gantry crane system there is no longer a need for beam structures, runway columns, or concrete foundations; therefore allowing you to have more of an uncluttered floor area.