I'm seeking a coaxial power plug (Size L - which is 5.0mm O.D. x 2.5mm I.D.). It fits the jack on Lionel's FasTrak Terminal Track Section.  I bought some from Radio Shack Online (#274-1588), but its cover housing is too small to contain the wires that must be soldered to its inside-the-cover terminals.  Is there another vendor who can supply this plug; a version with sufficient room for the wires?

Mike Mottler    LCCA 12349

Original Post

Would a 5.5mm x 2.5mm adapter work? Take a look at ebay listing #292809943305 and see if something like that might work. This was picked this one randomly, you can probably find a US seller with faster shipping times. There were also several of the type you have now that might be large enough for your wiring?

This was the search phrase I used - Male 5.0mm x 2.5mm DC Power Connector Jack Plug Adapter. Other variations might yield different results? Amazon also has assorted items like this. I haven't located a 5mm x 2.5mm one.  

RTR12

Thanks for that info. I'll try your suggested wording at eBay and hope for an appropriate response. I already tried some vendors:  Radio Shack Online, Del City, Allied Electronics -- but without success.  Surely this plug is "out there" somewhere. Perhaps I didn't call it by its rightful name.

Mike Mottler      LCCA 12394

GRJ knows a lot more about the sizes of these things than I do. I bet he's on to something with the 5.5mm size. I think they sometimes call these things barrel jack adapters, DC power adapters, something like that too.

There actually is a size L power plug that it 5.0/2.5mm, so maybe the 5.5 would be just a bit too tight.  Of course, the Type L plug seems to be a rare bird, probably why Lionel picked it!

FWIW, the power plugs on the command bases are the 5.5/2.5 size, that's what I needed to make my tethers for the TMCC buffer.

gunrunnerjohn posted:

There actually is a size L power plug that it 5.0/2.5mm, so maybe the 5.5 would be just a bit too tight.  Of course, the Type L plug seems to be a rare bird, probably why Lionel picked it!

FWIW, the power plugs on the command bases are the 5.5/2.5 size, that's what I needed to make my tethers for the TMCC buffer.

gunrunnerjohn:

Right, there are plenty of 5.5 x 2.5 mm coaxial plugs in the marketplace. Apparently the difference of 5.0 to 5.5 mm (as the outside diameter is just enough to "not fit."  I bought two Radio Shack coaxial plugs as "Size L" and they fit the jack on a Lionel FasTrack Terminal Track Section perfectly, but the problem is, its cover cap is too small to accommodate soldering the output wires from a Lionel 74 watt wall wort to the very small solder terminal under the cover cap.  A case of "building a boat in the basement, then realizing that it's too wide to be moved outside and to the lake."

Regretfully, I cut the factory "size L" coaxial plug off the 74-watt wort so that I could attach the then-bare wires to a Lionel lock-on attached to tubular track. That worked fine for a while, but when I adopted FasTrack for dual circles at the base of the Christmas tree, I needed a "size L" coaxial plug. So I am my own worst enemy.

I sent a note to Lionel at their TALK TO US e-mail address and inquired about a "Size L" plug, but I haven't heard back from them yet. I wonder if "Size L" is proprietary to Lionel.

Mike Mottler    LCCA 12394

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