There are buyer. To start with, a location would help. What is the size of rail, wt per yard if you know it, otherwise, the heigth and width of the base will tell most of us?
Was your dad part of Two Foot Gage Owner Association (TFGOA)? If so, you can advertize in the Two Footer Magazine, and you will reach most of the buyers. Light rail will bring more than $1 a foot. How many turnouts do you have?