We just returned from Alaska on Sunday PM.
We took the last train of the day (4PM?)out of Skagway and it was wonderful. The weather was very clear and conductor said it was the clearest of the season so far (chamber of commerce comment?). At one spot we could clearly view back out of the valley into the harbor and saw the ships clearly.
A real benefit that I appreciated is that the car we were in (off ms Statendam) only had 10 passangers so we each had a full seat~on both sides of the train~ for the entire trip. We were in the first car going up (good view of engines) but we were the last car going down with a full unencumbered view of the entire gorgeous trip off the back porch of the car!!!