What will be the best toys/games a dad can get for her 8 month old daughter. Like my daughter loves to see train running on track. what are other such toys/games I can get for her?

Since your daughter loves the movement of the train running on the track, you can consider a toy that appeals to baby's senses like the "Go Baby Go! 1-2-3 Crawl Along Snail". There is a mirror which will allow baby to react to her reflection, it will play music appealing to her hearing and vibrate in different motions and crawl along with your child.