Many of Lionel's manual say that even when super specialized tools are not needed.
You can take a look at the parts breakdown here and you can see that two types of lamps are used:
https://www.lionelsupport.com/...87-a935-d9e234c931cc
6204176302 LAMP / 14V 130MA / W/ BASE / WIRED / DINER
6204176301 LAMP / 18V 0.1MA / CLEAR / BI-PIN
While Lionel doesn't stock both bulb types, forum sponsor @S AND W does: http://www.sandwparts.com/Parts%20List/10%20Digit.pdf