Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. Located in the university's innovation park a newly built Nottingham Geospatial Building (NGB), where the Institute of Engineering Surveying and Space Geodesy is based, has a unique roof based laboratory. As the main component of this laboratory, an approximate 8 shaped mini railway track of 120m long and 184.15mm wide is constructed for dynamic positioning system research & testing. Equipped with a custom designed remote controlled locomotive that has been designed to carry differrent grade nertial units and other state-of-the-art location sensors such geodetic and bespoke GNSS and Locatalite receivers, the locomotive platform has the capability to provide sub-centimetre level real-time positioning accuracy that has been extensively used for developing and testing integrated navigation and positioning solutions. In this study the overall objective is to precisely determine the ground truth location of the railway track using a high specs laser scanner for the formation of a standard reference. Details about how to set up the field data acquisition procedures to achieve mm level positioning accuracy, 3D mesh approach for the track feature extraction and using the collision modelling method to detect abnormal points of the railway tracks (a simulated one in this case) are introduced in the paper. To verify the achievable accuracy of laser scanning technology, ground truth points measured with other location methods are compared with the sample points and the results are presented in the paper. The dense enough precise 3D track locations will serve the ground truth to estimate the real-time locations of the locomotive that are determined with inetgrated GNSS systems. It is anticipated that the similar procedures will be employed to monitor the high speed railway tracks in China.