Older Spectrum Passenger Cars Lit?

[plint]

Are these all lighted or  just some?  Is there a number series that specifies lights?  Just wondering if Bachmann always put lights in these cars.

[jonathan]

I have 10 of the older heavyweight passenger cars. There were not prelit. However, the trucks came pre-wired. Thus, adding lighting is/was a piece of cake. I used LEDs wired in both directions (polarity). Lights stay on in both directions.

Regards,

Jonathan

[plint]

How do you add lights?  LED kits?