I have converted two of the gold Hudson locomotives to PS2 for forum members. If you have the engine and want it upgraded, go for it. It is a beautiful engine with the Pittman monster motor. I left the rear coupler (PS1) and could get it to fire at about 12 volts. I may have one headed my way from my add looking for inoperative shelf queens. I have all the working boards from my last gold upgrade. Time will tell. I always test the boards on every engine I upgrade so they can be sold as a working set if someone ever needs boards. I have a large number of PS1 boards if anyone is looking for a set.
I do not think Mike will do this again in gold.