Does one exist? otherwise, I will probably just relight it, like a normal car.
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It could be as simple as changing a capacitor on the board in the car. I've never looked at the board, so I can't say for sure.
Could you post a photo of the board?
If John's capacitor idea applies, it probably needs a larger value to slow the timing...point being it would be easy to experiment by placing another capacitor across the original (in parallel) to increase the value.
OTOH, many modern flashing/blinking lighting circuits use 25 cent microcontrollers chips with built-in oscillators so you can't access the timing. A closeup photo would resolve this.
Hence the phrase "It could be" in my response. 
There's the board. Any ideas? 1st pic. Track input at the top 3 bulb output on bottom.
2nd pic, that board gets busy! Doesn't look like a simple fix.
Totally side note: I'm not a small guy 6'2 230, when you need something lifted, I'm in. How does a whimpy guy like me have such trouble with the window tabs on Lionel passenger cars?
I realize it may be hard to closeup this part circled in pink, but can you make out the white lettering/markings it? I believe this is a microcontroller chip which means you probably out of luck. The first board looks like a simple power supply board (I see a 5V regulator chip on it).
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It's really hard to tell from the picture but that could be a sophisticated micro controller thingy or it could be a really simple 555 timer. If its a 555 timer then changing a resistor or capacitor may be all that is needed. Unfortunately it will probably be more trouble than its worth.
I can't make it out, but it is an 8 pin chip. I will rephrase the question, looking for a "flicker circuit" when I swap the lights to LEDs, if I put in the ps2 upgrade.Maybe something like have in my lighthouse. Or maybe constant lighting will be fine as the current flicker is a distraction, rather than an enhancement
Turns out I can zoom in. Camera phones just keep improving. Timer or microchip? For the sake of posterity.
Also, from now on, if I open a passenger car, Im shaving the top edge of the clip windows with an xacto knife. Not flush, but just a bit
the wire bundle covers the full number on the chip, but I would guess it is a 555 timer chip given we can see ne5
here is a link to see so more data on it
http://en.wikipedia.org/wiki/555_timer_IC
Originally Posted by Flash:
...Unfortunately it will probably be more trouble than its worth.
If it is indeed a 555 timer chip, the part marking should say NE555 in full (according to the ST manufacturer's data sheet anyway). But I'm with Flash on this one; I think it's time to regroup and determine exactly what you want. That is, if you're going to LED and this is incandescent, it's likely you will have to fuss with more than changing kist a timing capacitor. These tiny surface-mounted components can be a hassle to work with including the logistics of getting just 1 or 2 pieces.
But it appears you have a source of 5V from the first board so this could make it easier. Then I think it comes down to getting lucky and finding a suitable animation circuit whether off-the-shelf or DIY. For example, in a previous thread we discussed those flicker circuit you find in LED candles. I think you now get 2 or 3 candles for $1 at DollarTree or the like and by changing the LED with a different color, we found you can make a flickering circuit for much less than off-the-shelf modules. For example use red/orange LED for campfire simulator, blue/white LED for welding simulator, etc.
