Just a piece of information for anyone who has an Accucraft S-12. This past weekend I learned that Accucraft did not use any lock tight on these loco's. I have run mine about 10-15 hours and this weekend I learned the hard way that with this loco in particular you need to check that ALL small bolts and nuts are tight. I usually check the running gear after each run and all seemed OK, but this weekend after 20 minutes for running the engineers side cross head fell apart bending the compound link and maybe the piston rod. (I hope not!) I will look for all of my spair bolts and put it back together and try it. So those of you that have one be sure to check all of the hardware even the odd stuff that should not come lose.