Can I take a large suitcase on the train?

A condition, not a measurement

Korail does not publish a dimension for luggage. It publishes a test: an individual passenger must be able to carry their own luggage, and no more than two pieces. There is no chart to check a case against.

The rest of the rule is about the space around you rather than the bag itself — luggage must not occupy a seat or block the aisle. A case that clears both halves is allowed whatever its size.

So there is nothing to book

With no dimensional limit there is no oversized category, no supplement and no space to reserve. You buy a seat, you carry your bags on, and that is the whole procedure.

This is worth saying plainly because the instinct arriving from either neighbour is to look for a form. Japan asks you to reserve the space behind the last row once the three sides added together pass 160cm; China caps each item at 130cm and 20kg on high-speed trains. Korea asks for neither.

Bicycles and pets are where the numbers are

A bicycle must be folded before boarding. One that does not fold has to be taken apart and put in a bag — this is the one place the rule is absolute rather than a judgement.

A pet travels inside a carrier, must weigh under 10kg, and the carrier's three sides added together may not exceed 100cm, which the guidance illustrates as 45 × 30 × 25cm. Vaccination is required, and animals likely to alarm other passengers are not carried at all.

Good to know

• No size limit — two pieces you can carry yourself
• Must not occupy a seat or block the aisle
• Nothing to reserve, no oversized category
• Bicycles fold, or come apart and go in a bag
• Pets under 10kg, carrier no more than 100cm around

Sources: KORAIL — Lost & Found and Baggage Regulations · Updated Aug 2026