Well the long part was processing it and adding in the captions. That took several hours. The pictures of the ROW took basically the time of a slowish walk. I also had to research where the rails went via historicaerials and some photos. Luckily in Sausalito, which was the only really confusing part, there were just a few rails in concrete to point me on my way. I guess the rails will be pulled up some day but for now they just pave them over like Jerusalem.