The last couple of years when we went to the top of Mt. Washington we took the Washington Stage Line van. This year we took the Cog Rail which was a different experience. I would highly recommend this as a way to visit to the top of Mt. Washington. You can drive however you must have nerves of steel because there are not guard rails and it is a very narrow two-way road. There are people who get so scared that they cannot finish their trip. A van driver needs to drive their vehicle back down to the base. Think about a straight down drop from the top of that mountain, no guard rails, then a tour van approaches from the other direction and there is not really enough room for you both! Yes, people freeze up at the wheel. The Cog Rail is a nice alternative. See here for part one of the 2013 NH visit. Here is a video from the patio of the Cog Rail building of the view. Also check out the Cog Rail website.
Below are a few pictures that we took on our trip up the mountain. The quality is not always that great since the train is moving and you are going up a mountain you are learning back in your seat. The seats are designed just for that purpose. On the ground they seem odd but very shortly you understand why they are curved as such. Also as you go up the mountain you will notice the vegetation becomes much smaller in size. Plus there is a building on the side of the tracks that looks like it is leaning – but it is actually level.