A little history...
The history of the Mehano locomotives [they made a 4-6-2 and a 2-8-2 and perhaps the 2-8-0 as well,] is somewhat interesting. This is from what I can piece together...
You may recall the Tyco era, that time between the Good Mantua mechanism and the reinvented Good Mantua mechanism, the era of the power drive. Somewhere near the end of the Tyco Era, they were making their 0-6-0s with the pancake drive - that's the best way I can locate this part of history. Tyco knew they needed a better product, I do believe, or they needed to do something with the train product line.
At the end of the Tyco era, Tyco thus redeveloped developed these three locomotives - the 2-8-0, the 4-6-2, and the 2-8-2. Up until this point, the 2-8-0 had been driven by a pancake motor in the tender; this round of upgrades saw the motor moved to the locomotive. The 4-6-2 is seen in at least one Tyco advertisement heralding this new achievement. But then something interesting happened
Tyco then decided they wanted to have nothing further to do with model railroading. They took the model railroad side of business and chopped it into two pieces, where as the new development - the 2-8-0, the 4-6-2, and the 2-8-2 fell into European maker's hands - perhaps because these makers had been commissioned by Tyco to do the development in the first place - and the Mantua side of business went back to being under the name Mantua.
The 2-8-0, the 4-6-2 and the 2-8-2 were then produced and sold under a variety of names including IHC on the better end of the spectrum and Mehano at the other end of the spectrum. If you compare these pieces, you will find they're almost entirely identical, with very little changes in either mold or mechanics.
If you doubt this genesis of the 2-8-0, this connection between the Tyco 2-8-0 and the IHC 2-8-0, I challenge anyone to take the two shells and look at them side by side. The resemblance is uncanny - almost every specific detail on the Tyco boiler is on the IHC boiler, AND in the exact same placement and orientation.
http://ho-scaletrains.net/tycotrains/id1.html
Anyhow, this page about the Chatanooga Choo Choo should help clear the mud - you see that ad from 1992? Right there is a Mehano made 0-8-0, which is in reality the 2-8-2 with both front and rear trucks removed. from what I'm reading, Mehano was the producer, Tyco and IHC were the distributors. Then Tyco shut down the train department, IHC picked it up...
http://ho-scaletrains.net/tycotrains/id88.html
Anyhow, what does this mean for you? If you can get them cheap enough, I suppose they will be fun to tinker around with. You'll get some mileage out of them, though they'll be short trains and I'm not sure about low speed performance. If you add a lot of weight to them, I do believe they start falling apart internally due to the all plastic construction.
I used to play with the idea of rebuilding old Tyco 2-8-0s into working locomotives by gearing and motoring them. However, I gave up the beasts when I realized the IHC is in essence what one would end up with if one did the conversion, the IHC has the advantage of slightly better flanges and the internal motor setup. And it also does have a metal frame under it all, which isn't too bad.
For what it's worth.