This data set contains 3D scanner data of two types of railway ballast “Calcite” (stems from Croatia) and “Kieselkalk”, also known as Helvetic Siliceous Limestone, (stems from Switzerland). From each type of ballast 25 stones are scanned. The files are provided in .ply format. For the scanned meshes several shape descriptors are provided: elongation, flatness, sphericity, convexity index. Additional to the 3D scans, both simplified and rounded versions of the meshes are included. For these meshes information on three different angularity indices are available. The scanned ballast types are the same, as previously investigated in uniaxial compression tests and direct shear tests: Suhr, Bettina, & Six, Klaus. (2018). "Compression tests and direct shear test of two types of railway ballast [Data set]" Zenodo. http://doi.org/10.5281/zenodo.1423742 A detailed shape analysis of the results is conducted in: Bettina Suhr, William A. Skipper, Roger Lewis, and Klaus Six "Shape analysis of railway ballast stones: curvature-based calculation of particle angularity" Scientific Reports, 2020, 10, 6045 DOI: https://doi.org/10.1038/s41598-020-62827-w A summary of several shape descriptors can be found in: B. Suhr and K. Six: "Simple particle shapes for DEM simulations of railway ballast -- influence of shape descriptors on packing behaviour" Granular Matter, 2020, 22 DOI: https://doi.org/10.1007/s10035-020-1009-0 This data set is organised as follows: 1_ScanMeshesCleaned scanned meshes: K_1.ply - K_25.ply Calcite (German: Kalzit) KK_1.ply - KK_25.ply Kieselkalk 2_CSE1 simplifications of the scanned meshes, little simplifications, used in the detailed shape analysis CSE1_AngInfo.csv: contains values of three different angularity indices used in the detailed shape analysis 3_CSE2 simplifications of the scanned meshes, more simplified, used in the detailed shape analysis CSE2_AngInfo.csv: contains values of three different angularity indices used in the detailed shape analysis 4_CSE3 simplifications of the scanned meshes, even more simplified, used in the detailed shape analysis CSE3_AngInfo.csv: contains values of three different angularity indices used in the detailed shape analysis 5_CSE4 simplifications of the scanned meshes, most simplified, used in the detailed shape analysis CSE4_AngInfo.csv: contains values of three different angularity indices used in the detailed shape analysis 6_RoundedMeshes artificially rounded versions of the scanned ballast meshes, used in the detailed shape analysis RoundedMeshes_AngInfo.csv: contains values of three different angularity indices used in the detailed shape analysis 7_TestBodies meshes of artificial test bodies, constructed for testing different angularity indices in the detailed shape analysis TestBodies_AngInfo.csv: contains values of three different angularity indices used in the detailed shape analysis scanMeshesInfo.csv: summary of several shape descriptors of the scanned meshes README.txt Check the README.txt file for more information on the technical aspects of scanning.