Put heavy rail, not light rail, on the Columbia River Crossing

The transport mavens who are planning the Columbia River Crossing should consider, if they haven't already, figuring out how the bridge can accommodate, not light rail, but heavy rail traffic, to replace or support the old SP&S (now BNSF) railroad bridge across the Columbia that's a few hundred yards downstream from the Interstate Bridges.  The railroad bridge is a swing bridge and is even more ancient than the older of the two Interstate Bridges; it opened in 1908.  If we're ever to have high-speed rail between Portland and Seattle, we need a bridge that can accommodate high-speed trains, and a century-old swing span doesn't cut it.