My wife really wanted to go to the NYBG on our trip, had read all about it. Cost was high $50, for the two of us. But we got to see the holiday train show too, so it was not to far out of line. Easy to get to from the train from Central Station, it even has its own stop. Even though it was winter we enjoyed walking the paths and seeing the plants and trees that were still out including one autumn blooming cherry that made it look like spring.
The ginger bread area is for small children and not much else. The train exhibit would be more accurately called the natural replica model display with a few trains added to the display. Not really an exhibit about trains, more focused on the small models of famous places and buildings with a few trains to tie them together, but with that said it was fun.
Forget the Tram unless you have disabilities, the park is small and it is great to get around and read the signs and explore all the little paths that wind around each area. All in it was worth the side trip but the cost was high compared to other things we did in the city for a winter visit.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.