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?

You can consider the Ikea Lillabo series. http://www.ikea.com/sg/en/catalog/categories/departments/childrens_ikea/18738/ Though it appeared to be meant for toddlers, I think if you are with her during the play session, it will be fine to just build a simple track and push the trains/vehicles through it. Just a suggestion! :)