Train+track system transport bandwidth scales with investment. In concrete terms you can put in more cars up to a point, and if tracks gets saturated you can bu

Train+track system transport bandwidth scales with investment. In concrete terms you can put in more cars up to a point, and if tracks gets saturated you can build more parallel tracks. Problems with pre existing rail network can be relevant when using existing old infrastructure, but if comparing to a new canal, the point of comparison should be a new rail connection.