I can build the wall In one year. There’s 85,607 x 2 miles of unused railroad tracks in US. Owned by the Department of transportation, so there paid for. The rails are 78 ft long, take them put on rail cars down to the border, stand on end and pile drive them in 8” A part. They replace approximately 600 miles of rails per year, there are stacks of old rails all over the country waiting to be picked up we can start with them.