train set
From Longman Dictionary of Contemporary EnglishRelated topics: Toystrain setˈtrain set noun [countable] DHTa toy train with railway tracksExamples from the Corpustrain set• Once he nicked my entire Corgi transporter filled with cars and a train set.• It was just a train set, indefinably old-fashioned.• I used the money to buy an electric train set, but frustratingly enough, it didn't work very well.• The display in the shop window was an extravagant scenario designed to showcase a monster train set.