I was looking at an old USGS map and it shows a branch (perhaps a mile or so long) coming off the old Reading Chester Valley Line in Exton (just west of where the Chester Valley Line crossed Route 30). It comes off the line and goes north, and appears to cross Route 30 exactly at the intersection of Route 30 and 100. The map is from about 1900. I've never even heard of a branch there. Of course, the way the area has grown, any trace of it is probably long gone. Can anyone shed any light on this. Thanks.