[openrailwaymap] Blank result from Tile Request

I have set up an OpenRailwayMap tile server on Ubuntu via this page: https://github.com/rurseekatze/OpenRailwayMap/blob/master/INSTALL.md I am no trying to test it via requesting a tile with a URL like: http:/mysever.com/standard/2/3/1.png This just returns a blank page, with no features drawn. I can see the request come into node-tileserver [2016-10-13 17:21:41.054] [INFO] [default] - Request for /standard/2/3/1.png received. I can also see the folders and *.json files being created here: /home/www/sites/194.245.35.149/site/orm/tiles However, the *.json files only look like this: {"features":[],"granularity":10} I have successfully imported the data into PostgeSQL, and can see the data in all the tables. Any idea what I am missing? -- Matt