Can I bring a large stroller on the train?

Technically yes, but it is highly discouraged. Large strollers block aisles and are difficult to move through turnstiles. Stick to compact strollers.

Where can I change a diaper in a station?

Look for the 'Multi-purpose' or 'Nursing' room signs in major stations. They are clean, private, and usually have dedicated changing tables.

Navigating Public Transportation in Japan with Kids

Use a digital IC card like Suica or Pasmo on your phone for seamless tap-and-go access across all transit lines. Plan your travel around mid-day off-peak hours to avoid the intense commuter rush, and always use the multi-purpose 'nursery' rooms found in major stations for quick diaper changes or feeding.

Digitize your fare payment. Add a Suica or Pasmo card to your Apple or Google Wallet before you leave. This eliminates the need to buy paper tickets for every transfer and lets you tap your phone at every turnstile, which is much faster than managing physical cards with squirming children.
Use the elevators, not the stairs. Look for the blue 'elevator' signs at every station. Japan’s subway stations are often multi-level mazes; elevators are usually located at the far ends of the platforms or near the 'multi-purpose' ticket gates.
Identify 'Family Friendly' carriages. On some local lines, look for the 'Priority Seat' stickers near the doors. While not exclusive to families, they are near the doors for easy boarding with a stroller, and local etiquette dictates you offer them to those in need—children and parents are generally well-received there.
Use station lockers for luggage. Do not attempt to navigate buses or crowded trains with large suitcases and a stroller. Rent a coin locker at the station for 400-800 yen to stash your bags, then explore the area with just the kids and the stroller.

Can I bring a large stroller on the train?: Technically yes, but it is highly discouraged. Large strollers block aisles and are difficult to move through turnstiles. Stick to compact strollers.
Where can I change a diaper in a station?: Look for the 'Multi-purpose' or 'Nursing' room signs in major stations. They are clean, private, and usually have dedicated changing tables.