We resolved the interference problem several years ago. The frequency the HO club was using conflicted with our MTH system. The HO club changed frequencies and that problem was resolved. After removing the surge protectors on 1/10/2015, we are monitoring the performance of different members trains. We are also following up on other comments you all have suggested and including adding another earth ground.
Is there a preferable elevation for the earth ground? Along the tracks, on poles just above the elevation of the train? I understand the wire should be at least two inches from the rail.
Thanks, Dave