Abstract: A process for supporting a railway track installation is proposed, in which vehicle tires, preferably used tires, completely filled with ballast, are embedded under each tire in a ballast layer, forming the lateral embankment with their outer sections. These embedded vehicle tires form a hold for the ballast layer in the embankment area, so that lateral yielding of the corresponding ballast is prevented in this area, to a great extent. In addition, such a process offers the possibility of using the extremely large number of used tires which come from road vehicles.

Abstract: There is provided a method and apparatus for inside surface finishing with a high degree of dimensional accuracy and axial parallelism for long bores of very small diameter in work pieces. The method employs a high tensile strength steel wire as the grinding tool rotating at high speed under tension just below its yield strength. The wire is reciprocally moved back and forth in an axial direction and is coated with abrasive material. The work piece with the wire passing through its bore to be surface finished, is rotated eccentrically with respect to the wire and is axially parallel thereto. The inner wall of the bore is pressed against the wire which passes therethrough. The apparatus includes two clamping devices which reciprocally move back and forth together with a common base plate and which are rotated by synchronized drives.