We utilize rail cars for our coke handling.  Coke is drilled directly in rail cars and then pushed down the track where water drains out the bottom of the cars onto the track.  Over time our rail tracks have sunken due to water and coke fine accumulation on the tracks.  This may be due to rail ties rotting out due to the water and coke.  Adjoining concrete blocks that we had in place had to be removed in most areas due to coke fines and water getting under them and floating them up.  We have numerous problems with unlevel tracks, loose rails, etc.  One of my coworkers heard someone at the coking.local seminar that we attended talk about some sort of padding that can be placed under the tracks and also some different types of rail ties that would not rot or be resistant to rotting.  Any ideas or advise would be appreciated?