Look what I found! Electrifying.

http://images.google.co.za/imgres?imgurl=http://iwr.ru.ac.za/~iwdf/railway/railway.jpg&imgrefurl=http://iwr.ru.ac.za/~iwdf/railway/index.html&usg=__5UHed8qv729DBgG2IGbs_Go00R0=&h=653&w=784&sz=121&hl=en&start=25&sig2=1iMFyx7eU5olmAIXOYpzkA&um=1&tbnid=ynIsWzOCSKicAM:&tbnh=119&tbnw=143&prev=/images%3Fq%3DDieprivier%26ndsp%3D20%26hl%3Den%26cr%3DcountryZA%26safe%3Doff%26sa%3DN%26start%3D20%26um%3D1%26newwindow%3D1&ei=skVBSogNmM60A6WKwK4J