Induced voltage calculation was explained in our paper published on Int. conferences:
Milešević, Boško; Haddad, Noël; Estimation of current through human body in case of contact with pipeline in the vicinity of a 50 Hz-electrified railway, EMC Europe 2013, Bruges, Belgium, 2013
Milešević, Boško; Filipović-Grčić, Božidar; Radošević; Tomislav, Analysis of Low Frequency Electromagnetic Fields and Calculation of Induced Voltages to an Underground Pipeline, 3rd International Youth Conference on Energetics 2011, Leiria, Portugal, 2011
Now, I am preparing a PhD thesis in this area.
Bosko Milesevic