It's maybe a stupid question.I want to buy a HO scale SPECTRUM HO SHAY TSUNAMI SOUND TRAIN,but there's Some doubt :
1.Is the smokestack plastic or metal?If install the smokegenerator,OK? ( SUETHE SMOKE GENERATORS ?)
2.Is the smokestack upon  the type of model? Can the diamond or upright shape be exchanged?
3.Except the smokestack,is any different about the shay (Product Code 80701-84705) ?
Thank's for help!