Hi Everyone
I have a Lionel Big boy with TMCC, and one of the green marker lights on the front of the locomotive is out. The entire engine has incandescent lighting. How do I go about changing the bulb.
Thanks
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The markers are LED that are usually replaced in pairs. The harness usually has a plug assembly.
They're ceramic LED's, you can buy the individual LED from Digikey, or buy the whole harness as Chuck suggests.
Here's where I got my ceramic LED's. Good price, reasonable shipping.
Reasonable shipping? I checked off 20 of the, $4.00. That seemed great, so I asked about shipping quote to PA. $17.85 to ship them! Sorry, that isn't reasonable by any stretch of the imagination!
It actually comes out to about 14, after the Australian conversion.
Well, $14 for shipping 1/2 oz of LED's is too rich for my blood. 
I bought a bunch of these when I found a surplus company selling them cheap, still working through that pile.
I know its high, but the only source I found, besides Digikey was this site. And Digikey wants $1.30 for one. So I figured the trade-off for shipping was ok, for me.
My problem is they didn't have red one, the color I use most of. If they had those, I'd have probably ordered a quantity of them as well as the green, then the shipping wouldn't be as much of a factor. For a small quantity, I'm better off with Digikey. Let's say ten of the green ones... I'd pay $10.56 for the parts and $3 shipping for First Class Mail. For my $14, I get the parts and the shipping. The difference is even more pronounced if I ordered less than ten, the shipping from Australia kills you. 
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Here is where I got Red ones. $.50 each. I dont remember what shipping was, though. They are in the US.
Bingo, that's where I got the last ones. Their not that cheap with shipping, but it's a minimum of $7.85. It was the cheapest I found on a search when I looked a few months back.
I bought 25 I recall. Just to have on hand for tender marker replacements and other visual enhancements
In general, the lights on the front of the engine that is leading the train are "classification lights" -- they provided information about the particular train: white indicated an "extra" not shown in the timetable; green indicated a scheduled train with a following section or sections; red on the caboose, last car, or tender of last engine (a marker light) indicated the end of a train, and thus provided confirmation that the train had passed intact. Dark (non-illuminated) class lights simply indicated a scheduled train without a following section (or sections).
I believe most of us know that, we just use the term "markers" in general for the small LED lighting on the front and rear.
OK, thanks -- I didn't know that "markers" had become a generic term for both.
Well, we'll have some naysayers come along and tell us that's incorrect terminology, but it's still widely used. I figure as long as we know what lights we're talking about, we pretty safe. We just trying to light them, not identify them. 
