This video of a three-year-old seeing a train for the first time is the cutest thing you'll see all day!

Most children love tractors and fire engines, but Madeline is absolutely obsessed with trains.

For her third birthday, the youngster got to ride on a train for the very first time - and her reaction is priceless! 

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Videos don't get much cuter than this! It's absolutely heartwarming!

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