Ive done a little research on athearn genesis locomtives,
Pros: Good Detail, Excellent Sounds when A dcc Tsunami SOundtraxx is installed
Cons: Price, Too heavy, and Dont run very slow
Now these are just my examinations and testing out, i dont like how heavy they are, they depend on perfect trackwork, 100% clean rails, or they dont pickup power, now im going to be using an atlas Dash8-40bw, it runs super smooth, can go extremely slow, and fairly fast, doesnt need the cleanest tracks, or perfect track aswell, ive tried a few locomotives and as athearn genesis are a great locomotive, i dislike them, as of these factors. MTH Atlas and Intermountain have great sounds, run smooth, and dont depend on 100% perfect and clean track to run at maximum performance
Most of my locomotives are Athrean blue box, I think they are not that heavy and the newer Athrean seems to be getting lighter and lighter as they are being released. The newer model do have great detail!!!.
I have a mix of Bachman (a 2-8-0 and 2 of 4-6-0) and Proto 2000 (an 0-6-0 and an 0-8-0) steam. None of the Bachman engines can match the absolutely oily smooth low speed perfomance of either Proto 2000 loco. Speed at or under 3 scale mph is reliable and even. It is fun to run them loaded out against the ruling grades on my layout and play with the wheelslip trying to get the train up the hill. Stall on the grade and come back on the throttle and get it going again without spinning the drivers just like the real guys had to do. Detail is superb as well.
The 2-8-0 bachman is my heaviest hauler and the smoothest low speed performance of the Bachmann Locos. The two 4-6-0s look just wonderful and while they do run smooth at lower speeds they somehow don't seem comfortable much below 10 scale MPH. Maybe they would run better on DCC. I don't know.
Based on my experience with the steamer I would go to Proto for diesels if I was forced to make the switch.
All of these locomotives are head over heels beyond the stuff from 20 - 30 years back. Detail, performance, reliability - they are just a treat. I do have to wonder what brass would be like for performance though.
I have a smattering- Proto 2000, Bachmann, Atlas, IHC, and old Mantua- both steam and diesel. Dave is absolutely right about the running qualities of the newer engines vs. the older ones and the proto engines being good runners. Unfortununately budget often dictates the selection of power, for example, the Bachmann Berkshire over the Proto 2000. However, I regard the Bachmann model as quite satisfactory and a good value for the price.
"Sometimes the technology just isn't there and you have to hit the anvil with the hammer."
I've watched a few reviews in YouTube about the proto2000 and bachmann steam they are very good, I was thinking about getting a steam loco, wether it ran or not for a showcase on my layout, I love the detail they had