> key points (like the issues with thermal expansion) are legitimate criticisms
No, thermal expansion criticism is not careful enough. See my comment:
No, thermal expansion criticism is not careful enough. See my comment:
When making an argument, sometimes it is good to make an assumption and then prove the assumption is false... sometimes it is just a straw man.
The tube will be supported by pillars which constrain the tube in the vertical direction but allow longitudinal slip for thermal expansion as well as dampened lateral slip to reduce the risk posed by earthquakes. In addition, the pillar to tube connection nominal position will be adjustable vertically and laterally to ensure proper alignment despite possible ground settling. These minimally constrained pillars to tube joints will also allow a smoother ride.