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]
[·] https://goo.gl/maps/gnrqGEdz3H7vz8V99
Context:
[·] https://en.wikipedia.org/wiki/Betuweroute