I have been happily surprised at how well the "Flat" track system worked. There is no elevation changes in the track. It is elevated at the packing station and the trading platform as these are low points, compared to the tunnel entrance for the traders crater.
Its taken a few days and many, many trial runs. Even with all the parts installed, Its taken over 10 attempts, as things have been adjusted, changed and ideas tested and thrown out due to lag, or simply just did not work.