I own seven 3rd Rail models, mainly articulateds but a few rigid frame models as well. Most of mine have been gone through and once you've had them apart and tend to their little issues as Tom referred to above, the 'scary mystery' of these highly detailed brass models is removed and they are fun to operate, especially when you upgrade them with ERR and the new Sunset 3rd Rail smoke unit and see your results. It becomes more personal as a part of that locomotive is your creativity. BTW, I'd much rather disassemble a 3rd Rail model anytime over a Lionel JLC Y6B, JLC Allegheny or their JLC/Legacy Big Boy or any other high end highly detailed model made by Lionel, those things are a bear!!!
Now, standing up a bit for the modern die cast models, I have two 3rd Rail N&W Y6B's and one JLC N&W Y6B and with the three of them sitting side by side, I dare anyone to locate the Lionel model. Lionel did such a fantastic job with the level of detail that it matches pound for pound with its 3rd rail cousins. I just recently got the Lionel model back from gunrunner John where he added the super-chuffer system with the rule 17 lighting and the improved smoke unit performance. Now, it sits there with the two 3rd Rail models with their ERR upgrades and 4-chuff per revolution and perform so much more realistically.
Proud to own all my Locomotives, 3rd Rail, Lionel, MTH, Weaver, Atlas and K-Line. Look at the photo below, one is brass (3rd Rail), the other die cast (Lionel). With CAD programs which are available now, die cast models can host a level of detail to challenge even the most detailed brass models, even Kohs' models. Look out Koh's, Lionel might be comin' for ya!! LOL
-Ralph