What am I? (A1+ Warm-up)

I use a long track. I transport heavy loads. Many tourists use me. Watch for lights to stop for me. I will show you beautiful scenery. What am I?

Please blow air in me. I come in many colours. I'm a symbol of celebration. Don't touch me with anything sharp. I only last a day or two. What am I?

Children love to play with me. I am not useful indoors. Don't tangle my long string. Look up and watch me dance. Run if you want me to fly faster. What am I?

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