In a swing iteration, the boundary of a geometric element segment repeatedly changes from left to right, then from the right to left, and finally stabilizes. Before the swing iterations, preliminary tangents and curves are identified based on the heading gradient (i.e., the rate of change of heading), and are set as initial values for the swing iterations. A genetic algorithm is developed to further refine the entire recreated alignment after the swing iterations. In the above processes, multiple constraints are handled. Applications demonstrate that this method can identify all horizontal geometric elements automatically and generate an optimized recreated alignment geometry for an existing railway while satisfying all the applicable constraints.

ZSH-50 Rail Curve Measuring Tools (50M)

String line rail curve measuring tool, is also called string line box for railway curve measurement. It is a necessary tool for railway works construction. Curve positive vector measuring box is a regular work in rail line maintenance. In order to facilitate the work of the worker to complete this job, a new line curve positive vector measuring box has been development.