Thank you Lee, Seth, Scott, Redball!!
Scott, right now it is a poplar 1x2. From the beginning I thought about needing something different that provides less drag and won't rub off some details from the underside of the bridge. Teflon coated would certainly provide less drag. I guess any smaller project on a layout is just like a layout as a whole; they both are never really finished. There is always room for improvement. Congratulations on bringing the grandsons up right!! I'm sure it does seem like yesterday. I was 35 when our first daughter was born, and she will be 30 soon.