This project is a demonstration of how sensitive high technology can be protected using archaic means. Heavy, hollow concrete elements are given so much inert mass that climatic forces are made to work with them instead of against them: in hot conditions, the moisture evaporating from the earth-filled, 1.20-metre thick roof elements has a cooling effect, while in frost conditions, it insulates them. The insulating and balancing qualities of the earth are all the more welcome, as the filling material for the roof elements is provided by the excavation for the foundations: the excavated earth, which does not have to be transported away, becomes insulation material that need not be delivered. Thanks to the rail transportation that is available to and from to the building site, the weight of the construction materials presents no hindrance. Also, the higher construction costs are offset by the practically free transport operations. The contents and function of the unmanned signal box cells cannot be portrayed. They are hidden in the humble, black-impregnated ashlars that lie like erratic blocks in the railway landscape.