The train layout that my father built for me for Christmas of 1960 was in terrible shape. After 10 years in a barn in Temecula, it had rodent damage and had been the target of thieves who stole all of the trains and accessories from it (not to mention a great many other trains.
I brought it to Alhambra about two years ago. Over I two to three month period, I removed the track, bleached the would to remove the rodent stains, painted the board, cleaned/replaced track, extended it by 4 feet, installed wide radius track (modified by Rich Riley), replaced about 90% of the wiring, replaced the missing stolen accessories, installed DCS and TMCC, and got everything working again.
I still need to do a bit more painting and touch up, but I have been running trains pretty much constantly since late spring of last year.
Before and after photos below.
After video: https://youtu.be/OZFnWJfPvnA