They are out there, I just picked up an MTH 20-3018 K4 for $99 that runs and sounds perfect. Also bought a Lionel legacy Polar K4 for a great price off this forum. They are out there!
People keep trying to sell him on MTH and conventional, I think he clearly stated he only wants a command controlled TMCC or Legacy model. 
My choice would the the Legacy K4, I bought mine used for $550, it has whistle smoke, IR sensor, and of course the great Legacy sound and control.
Dennis Holler posted:They are out there, I just picked up an MTH 20-3018 K4 for $99 that runs and sounds perfect. Also bought a Lionel legacy Polar K4 for a great price off this forum. They are out there!
Great acquisition. You can afford to gut it, install TMCC, and have both a great looking and great performing locomotive. 
George
Clearly, Dennis will need a Super-Chuffer for that one with TMCC.
My problem is I have about 5 brass williams, the mth K4, and a handfull of others that could all use the ERR/sound/superchuffer etc upgrades! Got to start with one of em certainly! I just got the legacy Polar road K4 for less than $300 and it is in great shape everything works. Paid $550 for the red legacy K4 on a blowout black friday a few years ago. Both are candidates for some green paint in my eyes but they are nice locos. Do you get the 10 wire harness from mth directly? Need to nail down what other components I need to get besides the boards to start one of these.
Yep, I get the tethers and mating connectors from MTH parts. I'd buy the Legacy Polar RR locomotive for $300 anytime of the week!
I have a RailKing K4s that i bought new when it first came out, added a Digital Dynamics Equalizer when it came out and then added ERR cruise and Railsounds when it first came out. Then sold the original MTH electronics to help recover some of the costs. I love it, and only wish that MTH would offer a RailKing E6 Atlantic in either RailKing or better yet RailKing Imperial of similar proportions.
Dennis,
Here is a video of my 2 Legacy K4s coming out of the yard double headed. The first K4 is #1330 a standard post war model that Lionel had in the 2012 catalog. I purchased this one from a forum member off the buy/sell forum. The 2nd K4 #3880 started life as a Polar K4. If you look real close at the builders plates it says "Polar RR #25". The one crazy thing about the Polar K4 was when I blew the whistle the steam smoke came out of the dome sideways, Lionel did not include a whistle shield used by the PRR so the steam would blow straight up and not blind the engineer. Don't know why they excluded a .25c part but it bugged me so I purchased a whistle shield made by Precision Scale and glued it to the boiler. Works just like #1330. The Legacy K4s are hard to find but well worth the trouble as the smoke, sound and operations are top notch and worth the effort. Oh by the way the Legacy K4 and the Kline K4 are both identical less the Legacy electronics. The Kline K4 #1361 handled 031 and 048 curves with no problem. I would thing the Lionel K4 would do as well. I never ran them on my home layout only at the club so I am just guessing.
JohnB
Thanks JohnB, Yes, I definitely love both my Legacy K4's and the #460 E6 (11224). Having them is providing most of the push or interest in upgrading my Williams Brass K4's. Besides, you can never really have too many scale K4's, I realized I'm up to 10, 2 Lionel, 4 Williams, 1 MTH, and 3 ancient Scale-craft not to mention another pile of semi-scale and postwar versions.....
Will have to look up whether PRR ever numbered a K4 as #25, I know they did have some low numbers so it is possible. Here's ,my Williams streamlined and std prewar K4, Williams L1, MTH first premier K4 and the Lionel 11319 and 11224 (E6) in the lower pic. I guess the one thing that might be true is if you can't find a Lionel Legacy K4, you should be able to purchase and upgrade either a Williams Brass or possibly one of the earlier MTH Scale K4's for the same or slightly less money if you are lucky. I haven't seen many of the recent Lionel Legacy K4's listed anywhere for less than $500, my Polar k4 being an exception. You have to look hard for those, and be ready to JUMP on it when you see it. Don't wait five minutes if the deal is that good. I've paid, $60, $79, $139, and $225 for my four Williams Brass K4's, found the MTH for $99 and the Polar K4 for less than $300. So that is 6 scale K4's for less than the list price of a single new Legacy K4... They are out there . Shake the bushes and Pounce!
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