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I don't remember any coaches going to Switzerland, I can only remember SIG bogies being trialled under 12140 (as well as the early/prototype T4 bogie) and that was all UK testing.
Vehicles 10581/673/705 were exported around 1993/4 and were converted to a tilting test train for SIG's tilting bogie design. The results from this saw this design used for SBB's Class 500 ICN units.
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