I believe the generic number is 1402.
It is a smaller screw base. The Lionel part number is 2420-20. They do not appear to have generic bulb number. Olsen's has them, http://train-station.com/Pages/archives/Library/PW-2420-20.html.
does anyone know what type of bulb this takes...thought it was a regular screw type....but it looks like it needs a smaller one
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