G'day,
I have scrounged the EUB incident report to the ICE derailment in 2008 inside Landruecken tunnel web link.
The then longest railway tunnel in Deutschland and had a crossover inside the tunnel.
https://www.jonroma.net/rail/acciden...ckentunnel.pdf
The report is naturally in German, but there are diagrams that will show the situation.
Steve.