Hawk64varsitypride: The best luck I've had with smoke is, first is too download #242 Renfe from Trensim.com..It has the smoke you want, and I have found it only works on Ben Neal's Baldwins..But it has tfx in the con-fig file that Bob Weber was talking about..The first thing you have to do is open up Cm and find the Renfe engine you downloaded..Right click on it, Then edit, edit explorer.,find humoconfederada.tfx, on the first window that pops up, high lite it and copy..Next find the engine you want to change, Right Click on it, then edit, edit explorer, and the first window to pop up paste humoconderada.tfx..Now open up con-fig and find stack.tfx, change it to "humoconderada.tfx..Hopefully you will have smoke..Good Luck