Norfolk Southern Railway Co.’s plans to build new culverts at crossings in Flowery Branch have been put off indefinitely, as the company awaits permission from the Army Corps of Engineers to work on Corps property. Officials requested permits from the corps in May, hoping to start construction this month and finish by fall, but they have since learned Corps right of way “is now required for new construction,” said Rick Harris, railroad spokesman. That wasn’t the case in 1957, when the original culverts were installed and the Corps was building Lake Lanier, “Once the easements are secured and the permits are issued by the Corps, we will start construction on the culverts,” Harris said.