See Purchasing Technology cards as a way to upgrade what you can do. Most of the cards are bought and kept in front of you helping your development (allowing you to claim longer routes or opening new areas for you to build).
In fact there are two technology cards that you don't keep but it's explicitely written in the rules: the "Right of Way" technology card and the "Thermocompressor" one (in the Advanced technology variant). You purchase those cards, apply them and return them to the pool for other players (or you for that matter) to purchase them again later.
manpreet![Tuteehub forum best answer]()
Best Answer
2 years ago
Are technology cards treated like the colour train cards and discarded once played, or do you keep them for future use?