If you find the actual #, it would be nice to nail down the part # once and for all. From the Brasseuer site and from the MTH Light Bulb chart:
![Untitled Untitled](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/84072378273304566/filePointer/84072378289088221/fodoid/84072378289088216/imageType/MEDIUM/inlineImage/true/Untitled.png)
Would be good to know if indeed the passenger car bulb is different/larger than the Realtrax track/switch bulb.
As my Realtrax switch and lock-on bulbs fail, I unsuccessfully look again to see if someone has come up with an off-the-shelf plug-and-play LED replacement. Until then, I replace them with a DIY LED contraption...not a recommended alternative - do not try this at home.
![lockon3 lockon3](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/84072378273304566/filePointer/84072378289088222/fodoid/84072378289088217/imageType/MEDIUM/inlineImage/true/lockon3.jpg)