Japan's bullet trains have spent six decades perfecting speed and punctuality. Now they're chasing something else entirely: privacy. The country's new Supreme Class Cabin, launched on JR Central's N700S Shinkansen, gives travellers their own locked, single- or double-occupancy capsule on the Tokaido and Sanyo lines between Tokyo and Hakata — with stops including Nagoya, Kyoto and Osaka.

The cabins, about 24 of which are currently running on roughly 12 services a day, were carved out of former staff space. Slide the door shut and you get a rounded sofa, a big reclining leather chair on the opposite side, wood-grain panelling and a hand-thrown Mino-yaki ceramic ornament made by artisans in Gifu. Controls run through a tablet: recline, lumbar support, leg rest, heated seat, lighting and airflow. There's 5G-compatible Wi-Fi (patchy in tunnels), a seatback 'Personalised Sound Zone' that pipes Bluetooth audio around your ears only, and a complimentary Uji matcha cake on arrival. Extra snacks and drinks — dried scallops, premium sake, beer — are ordered at the press of a button, though no full meals are served, so grab a station bento first.

A few quirks to know before booking. The seats are fixed, so unlike standard carriages they don't rotate, meaning you may ride facing backwards. And Mount Fuji only appears on one side of the train: the Fuji-facing cabin sits in Car 10, so it's worth checking which cabin you're assigned if the view matters to you.

Price is the real hurdle. A two-person cabin between Tokyo and Shin-Osaka runs ¥60,790 (about $552), a single ¥42,390 ($385) — versus roughly ¥14,520 ($132) in ordinary class and ¥19,390 ($176) in the Green Car, the previous top option. That positions Supreme Class squarely at business travellers, celebrities and couples marking an occasion; as one train journalist on the inaugural run put it, private cabins are common on French and Italian trains, and this is Japan's answer.

It's a genuinely new way to experience the world's most famous rail network: silent, sealed off from the crowds, watching rice fields and misty mountains slide past your own two windows. Bookings are open via smart-ex.jp/en and global.jr-central.co.jp, with capacity expected to expand in the coming months. If a $385 solo ride feels steep, the Green Car remains a sensible middle ground — but for a once-only splurge between Kyoto and Tokyo, few train journeys anywhere come close.

Story via Traveller (Sydney Morning Herald).