You can "ride" a train, or you can "take" a train. What's the difference?
You use "ride" when you want to talk about the experience of riding, or when you want to describe something that happened while you were riding the train:
I love riding the train in the middle of the day when it's not crowded.
I was riding the train, and this guy next to me started telling me a story about how he had just gotten out of prison.
You use "take" when you want to talk about how you get somewhere:
Just take the #3 train to 72nd Street and I'll meet you there.
Do you think it'll be faster to take the train or try to catch a bus?