There's (usually) a very good separation between the political and technical aspects of the project. You can take the Porta Alpina dise-project as an example (

There's (usually) a very good separation between the political and technical aspects of the project. You can take the Porta Alpina dise-project as an example (which wanted an underground station midway through the tunnel connecting to ski resorts). Despite strong political lobbying, the project was deemed uneconomical and canceled. If you compare it with the new span of the SF Bay Bridge, the difference is clear: there was far less political involvement in the technical details of the project in the Swiss case.