@MR_P posted:Ok, hum, i'll check it out, thanks !
Here is a link to the installation manual from MTH: https://mthtrains.com/sites/de...ction/50as10709i.pdf
It won't include a smoke unit as they would expect you to reuse the existing one. Ultimately these were made to retrofit into MTH engine but they will also work in a Williams. The tether from the tender may be the hard part to retrofit. I have done many Williams diesels with PS3 upgrade kits and they work quite well.