Back in 1996 Switzerland and Germany signed a non-binding agreement (Vertrag von Lugano) to increase the capacity for freight trains. Now in 2022 the Swiss part [0] with two 34km and 57km long tunnels through the Alps is basically finished meanwhile the German part is expected to be completed in 2042 [1]
[0] https://en.wikipedia.org/wiki/NRLA
[1] https://en.wikipedia.org/wiki/Karlsruhe%E2%80%93Basel_high-s...