A bimodal container chassis for supporting a container during roadway and railway transit includes a mainframe having first and second ends, a top edge and a bottom angled edge. The bottom angled edge is positioned at an angle from horizontal. A running gear attachment is connected to the mainframe and slidable along the bottom angled edge in first and second directions between an over-the-road position and an over-the-rail position. The first direction is upward and toward the first end and the second direction is downward and toward the second end such that the running gear attachment is disposed adjacent the second end when in the over-the-road position and disposed upward relative to the over-the-road position and toward the first end when in the over-the-rail position.