Between 2000 and 2001, several alternatives were proposed: Plans S and S1 – minor repairs of the old single-track route (S), or one that also includes a few short tunnels and curve straightening (S1).
2000至2001年間提出了若干定線方案： S及S1計劃：舊單線路線進行少量修補（S），或是加設少量短隧道和彎道拉直（S1）。