Dear Mr.H0riz0n,
The first line opened in 1989 (there is no object – OPEN here is INTRANSITIVE),
The first line was opened in 1989 (this the passive form – OPEN here is TRANSITIVE),
The government opened the first line in 1989 (the firstline is the object – OPEN here is TRANSITIVE),
It is not a shop or a restaurant. It is something starting operating as in definition 6. Definition 6 used it both active and passive in the very same words but in the present: opens and is opened
Best Regards
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