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![DCVG Survey - A Beginner's Guide [Part 1]](https://images.squarespace-cdn.com/content/v1/5a96c196c3c16a1b83e4726a/1523463346907-BWMZRKKL3HG136KEUHG9/DCVG_Rural.jpg)
Interference from dc traction systems can result in pipe-to-soil potentials outside of the acceptable limits.
The Q method is an established procedure for evaluating the time varying potentials and empirical guidelines have been developed to allow a judgement of the corrosion risk caused by the interference.
The method can be used to evaluate current densities as well as potentials.