RIDDLE GAME

I thunder down the tracks, swift as the wind. I have an engine but no smoke, a whistle but no flame. What am I?

What creature walks on four legs in the morning, two legs in the afternoon, and three in the evening?

If you keep me, I am yours. If you share me, I vanish. I’m powerful when hidden, powerless when spoken. What am I?

I’m black before you use me, white when I’ve been touched, and clean again with a single sweep. I show knowledge but cannot keep it. What am I?

I spend my days with razors and scissors. I give others a clean face, yet I can never give the same gift to myself. Who am I?

I’m fragile though I have no bones. I hold life inside yet fit in your hand. Crack me and I’m finished; leave me whole and I may bring forth a bird.