Hello all. My parents have a mid-1950s Lionel set in good condition that I would like to see running again. I never got to see it running when I grew up, and now I'd like to show my boys the thrill of Lionel. It has been stored for the past 30-40 years. According to my mother, the engine no longer ran when it was put away. It has a table-mounted track. I'd like to assess what all I should expect in terms of maintenance, refurbishing, and cost before I tackle this project. Ideally, I do most or all of it myself, as I have some mechanical skills. I have a copy of Greenberg's repair manual that I have perused, but still need to brush up on many other references (including this forum). The train and track itself appears to be in good condition: no rust or obvious missing pieces, wiring appears intact (although old); most pieces are still in the original Lionel boxes. Looking for advice on what to expect for this project and what my first steps should be. I'd also be curious what the approximate value of this set is, although as a family heirloom I don't expect to part with it.

Set includes:
LW 125-watt transformer
#2055 engine
#6026W tender w/whistle
#6436 hopper car
#464 sawmill
#6560 work crane
#3494-275 operating box car
#395 floodlight tower
#6465 tank car
#3562 operating barrel car
#6357 caboose
#356-44 automatic freight station
#6419 wrecker caboose (1955 model)
#6424? log car

Also Marx:
#65 water tower
#73/3 lamp post set

Thanks all.