My old 1950s trains--including 6557 caboose--sit for 11 months, and get used around the tree this time of year. The GE 55 bulb was working as well as it ever has since I set it up this weekend with various degrees of flickering, but tonight I noticed it's completely dead. Swapped out the GE 55, wiggled the wires, checked the solder joints...but nothing. Dead. Any suggestions for a non-tinkerer here as to what may be going on?