For this production process, the concrete is placed in moulds, compacted, and de-moulded only when it has attained the required strength. Multiple moulds are used here, with cavities for up to four sleepers next to each other. All of the concrete bi-block sleepers are inter-connected by means of two lattice girders. This configuration assures exact positioning of the sleeper blocks.

The form is moved onward in carousel fashion, and can be used again for fresh concrete only after the pre-stressed sleeper has been removed from the form. This means that a great number of forms is required for this particular type of continuous production process.

This process enables great levels of productivity and flexibility. The number and geometry of moulds can be optimally adapted to the individual requirements of each and every project. This manufacturing technique can also be used for plants near the construction site, and for cost-effective mobile production facilities.