by ic9623
I had an opertunity today to check out the progress of track replacement on the UPs ex MoPac Line through Sullivan,IL. I saw all the equipment they were using. All were very familiar except one. It was a machine that put foam down on the rails or ties. What exactly is this doing? The foam is in 2 seperate liquids and combined by the machine and put down. I looked at new track and could not see the foam other than were it splatered over the road bed and edge of the rail. Why are they using foam??