National railcardsThey cost £30 (£20 for the Disabled Persons card). Not just for Brits! You don't need to live in Britain or be a UK citizen to be eligible. However, they can only be posted to UK addresses.
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The 16-25 Railcard gives you 1/3 off train fares throughout Great Britain. As the name suggests, the Railcard is only available for people aged between 16 and 25. However, you can also apply for one if you're a mature student in full-time study, as long as you're eligible.
Freedom Pass (London)If you are 66 or over and live in London borough, or have a disability and live in London, this pass allows you to travel for free or get discounts on a range of transport services across London, including most National Rail services.
If you live outside of the UK, you are not eligible to buy railcards online. However, you can do so via a registered travel agent or at a UK train station. This means if you're coming to the UK to study in the summer, for example, you would be able to buy a railcard.