I put the tree up tonight and broke out my uncles old 665 Hudson out. It ran fine about 3 years ago when I ran it last. Since then it has sat on a display shelf over my layout until it was packed away carefully when the layout came down about 3 months ago.
I tried running it today around the tree on Fastrack with a CW-80. It really just sat there and moaned and groaned but barely ran. I did lube up all the running gear, but haven't replaced the grease in it in some time. Tomorrow I will get some grease and re-grease it.
Could it be the Cw-80? I have always ran it with my post war TW in the past.