I suggest a 4 1/2 hours visit. The most interesting is trains (2 hours) with a giant model scale of the Gotthard (not the Base Tunnel) which you should look from every corner (30 min)
Planes and space merit one hour. You may enter a Convair Coronado, one of the first four motor jets, with only 3+2 seats in a row. It was an extraordinary machine.
Ships should take one more hour, specially if you know about sail competition. (The swiss are awesome sail sailors)
The last 30 min are for cars.
If you have kids, there are lot of activities for them.
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