I happened upon an article by Jason Cole regarding his WiFi Solver so I reached out to him in hopes that he may be able to point me in the right direction as my Google searches had come up empty.

He was quickly able to locate 2 papers which cite the interference electric trains create including RF disturbances

http://www.ofcom.org.uk/static/archive/ra/topics/research/topics/emc/potential-interference.pdf

http://cdn.intechopen.com/pdfs-wm/23863.pdf

He also provided the guidance below:

"This is because as the train passes you will be witnessing a huge temporal variation in local electrical current and voltage, which can induce currents in metallic objects and radiate electromagnetic energy. To help prevent it, perhaps some kind of earthed mesh like a Faraday cage between the trains and the router? I'd be interested to know if anything in particular helps.

To see if sufficient voltage is generated, perhaps try connecting a few large loops of copper wire through an LED to earth? The loops will pick up any stray B fields, generating a current which should be conducted to earth. Again, I'd be interested to know if sufficient energy was radiated to get anything to light up."

I am going to experiment with wiring up some LED's to the copper in order to see if I am gathering a sufficient charge to power them and potentially exhaust the stray current. If that fails I'll experiment with something like a faraday cage or perhaps some EM shielding paint.