Railroad Track Ground


Anybody have an opinion on the suitabilty of a abandoned, partially 
buried railroad track as a ground?

We're planning on renting out the coil for a video shoot in downtown Los 
Angeles (the scummy industrial part) and the ground at the site is to 
hard or asphalt covered to bury copper poles and flashing. We are 
thinking of drilling and tapping a 3/8" ground lug on one of the 
nearby railroad tracks which is partially uncovered (the rest is buried 
under the street).

Any thoughts?...   ...Jeff Parisse