Identifying Bulb Voltage

Most train lite bulbs don’t exceed 18 volts.You can get info on K Line passenger car lights and your problems are over

Mikey

can you wire in the bulbs to the variable voltage post on your transformer?  This should give you some idea, if the transformer doesn't have V meter you can use a hand held meter. Hope this helps

I fire up my bench power supply, it has variable voltage from 0 to 30V.  I just slowly increase the voltage until the bulb looks right and read the voltage off the meter.  As a bonus, I get the current reading as well.