Great info, thanks guys. Another short story. I have a legacy lionmaster big boy that needed a dcrd driver board. This engine was from about 2010 or so I think. This week I just got another lionmaster legacy big boy this one has whistle steam. Got it here off the foresale board from another ogr member. It smoked great btw, but even better after servicing the smoke unit and cleaning up all the funnels and parts. The whistle steam feature especially works very well in this engine.
So I finnaly decided to repair my old lionmaster legacy big boy after it being down for at least a year. So I could run it along side my new to me legacy lionmaster bigboy. Thankfully lionel still has parts for most liomaster engines on their repair website.
This engine repair is another reason I asked this question and started this thread topic. Some locomotive we all have are as one poster stated earlier tmcc or older mth ps2 5 and 3 volt electronics. When going to lionels parts web pages I see a few unavalible parts listed for even legacy models not that old. Not sure how manufacturers make spare parts decisions. What to have instock and how many. It seems that while lionel and others have what seems like thousands of parts for thier engines. It never fails that the one part you need is no longer available every so often.
Now with a large and ever growing collection of engines not to mention all of the other stuff needed to enjoy this great hobby. Changing scales or hobbies is not in the card for me. Besides I just plain love ogauge trains. So just like the real railroads keeping our engines running is all part of the hobby. This is why now with mth closing and lionel always introducing new board technology. It got me to thinking and re assessing my engine collection and parts inventory.
Other than traction tires, smoke resistors, smoke wicks and occasional misc. Parts keept from older broken engines I once had. I have only gotten a major part if the need arised. Now I am thinking that some pcb boards such as fan control and early ac smoke regulator boards maybe worth having spares of in case years down the road the parts are not available. I woud get only the ones needed for my specific engines. A just incase so to speek. That is if lionel has them still available. So my engine fleet will never hopefully have an engine that does not run as it should years from now.
Just one more reason I got curios and started this topic. Thanks for all your repiles and input on this.