One passenger expected advanced soundproofing technology but was surprised to find that the "quiet" was maintained entirely by staff politely reminding travelers to lower their voices.
The "quiet carriage" uses the same materials and structure as a regular carriage, with ticket prices also being the same. In addition to staff acting as "discipline monitors", it offers a few thoughtful features: announcements are played at just 30 percent to 40 percent of the usual volume, and crew members give passengers one-on-one reminders before their stop.