Report by T.J Barlow and A.D. Zdunek on stray current corrosion in electrified rail systems at:
http://www.iti.northwestern.edu/projects/stray2.html

Ductile Iron Pipe Research Association (DIPRA)
www.dipra.org
look under "Publications" for an on-line article: "Stray Current Effects on Ductile Iron Pipe".