Shimla (or Simla) can be approached by air/train/road. Although the train takes longest time (some 6 hrs)from Kalka, journey is certainely a worthwhile. Forest goes all along the route while the train moves to higher altitude (from 300 m to 1900 m above sea level), and it is very pleasant to see the sunrise across hills and valleys. A cup of tea at any station is not only refreshing, but has got a good taste too. As the journey starts, many people try to find seats in the train, but after few minutes, everybody seems to get off the seat and peek out of any opening available. I would recomment to go in non-deluxe train for real experience. And don't be shy to shout loud if you like, while the train passes through several tunnels.