Separate a possible connection from a comfortable one
A journey planner may sell an itinerary that meets the railway's connection rules. That does not mean it includes time to buy lunch, find a bathroom or work out an unfamiliar lift route. Before booking, identify whether you stay on one platform, cross a footbridge, move between underground and mainline platforms or leave for a different station.
A traveler carrying a light backpack may make a transfer differently from a family with a stroller or someone who needs step-free access. Use the station's official access information. If assistance is required, arrange it through the operator rather than assuming an ordinary transfer estimate covers that service.
Look at the train after your train
The cost of a missed connection depends partly on what follows. A frequent regional service is a different situation from the last departure of the evening or a sleeper with reserved accommodation. Check the later options before deciding that a tight connection is worth a slightly shorter advertised journey.
Keep ticket conditions separate from timing. A longer buffer does not itself create missed-connection protection, and a single shopping basket does not always mean one through-ticket. Ask the seller to clarify the ticket arrangement if it is unclear. Where continuation rights or agreements apply, the operator's instructions still matter.
Adjust the search, then inspect the result
Some railway planners allow you to request a longer interchange. Deutsche Bahn's travel-information tools provide options for transfer time and fewer changes. Compare a direct train or a simpler interchange even when the total trip takes longer; it may leave less to coordinate.
After changing the search, review the fares and ticket conditions again. A lengthy stop can sometimes change the offer rather than merely adding breathing room. Do not assume that two results with similar times are sold on identical terms.
Spend the spare time inside the station
On travel day, confirm the onward platform before leaving to find food. Recheck the departure board after any announcement; platform information saved the previous evening is not definitive. Keep your tickets and essential items accessible so that a platform change is a movement problem, not a packing exercise. A useful buffer is time you can actually use, not a promise that the first train cannot run late.
