I'm not entirely sure but I assumed it is the year the train has been in service, hence the '1998 to present' on the sets. A lot of sets are just variations such as deluxe or basic version.
The cool thing about the database is you can search on the name so if you search for MTR you get all entries with MTR in the name. You can try it also for the Taiwan High Speed Rail if you search for THSR in the name like this:
https://ttdb.info/index.php?search=name&query=thsr
(This post was last modified: 11-16-2019, 07:14 PM by Super.)
The cool thing about the database is you can search on the name so if you search for MTR you get all entries with MTR in the name. You can try it also for the Taiwan High Speed Rail if you search for THSR in the name like this:
https://ttdb.info/index.php?search=name&query=thsr
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