All steam owning forumites, from you personal experience which model (and manufacturer's) steam engine consistently been your best smoker right out of the box with no modifications needed? My 3 year-old nephew is in awe of smoking locomotives every time he sees one. Since he enjoys them so much I want to get the best one to run for him when he comes over. Whether it's conventional or digital is not as issue -- just so it's smoke output is totally awesome.
Please popst your recommendations based either on what's in your own collection or those engines belonging to others which have left you spellbound and speechless.