The ClearanceSim 2000 railroad clearance analysis tool was developed by ZETA-TECH Associates, Inc. The software is an interactive user-friendly Windows application that allows the user to test rail car clearance in a simulated manner rather than out in the field. The OpenGL powered 32-bit system was developed for users running Windows95/NT operating system or higher.

The primary interface screen is shown below along with the system menu, navigation bar, and simulator views. Graphic representations of the vehicle through the analysis area are displayed as well as location where interference is detected.

The main benefit of using the ZETA-TECH ClearanceSim software is the ability to test several scenarios without having to invest in special testing hardware, not to mention the incredible amount of time saved by running the tests in a simulated environment.

The test process begins by the user defining a set of test parameters. These parameters are used by ClearanceSim to perform its analysis and generate reports. The parameters include the static vehicle characteristics and dimensions, and also the track characteristics, along with several software feature related parameters. The user has the option of running the test on the entire length of the analysis area, or just a segment of it. At any given time the analysis can be paused for careful inspection, then resumed. The user also has an option of stepping forward and back to test only a certain location where interference points may be located.

The ClearanceSim model can accurately determine the interference points for any given environment. The entire test area is geographically recreated to scale. All elements used in the simulation are proportionately scaled to accurately represent and recreate the existing natural conditions. While the simulation is running, the user has a constant view of the progress of a moving rail car. The user can view and understand where and when collisions with the surrounding environment can happen. The complexity of the damage is presented to the user for each interference point in the form of depth of collision.