I like some operating accessories on the layout. I prefer them to be s-l-o-w-e-d down a bit now that the electronic technology is there. Make them a realistic scale size so they can blend into the scenery.
IMO MTH newer versions of classic Lionel designs were/are on the right track, no pun intended.
And of course MTH's most recent water tower which is a significant improvement over the original:
Lastly, while not an operating accessory persay. Slowing down the dump cars is good too. No catapulting load:
