Recently got a Acucraft Goose #2 and when I put it next to my Bachmann Climax, I was amazed how the Goose actually is bigger than Climax. Both are supposed to be 1:20 scale. Is this accurate?
The freight box on the RGS #2 is pretty big which gives the goose a big look, this could over whelm a Climax which are small engines in general. Not knowing if your models are scaled correctly, but this can happen in G scale when running with other scales that are close in size. I know for myself that I model in LGB Scale 1:22.5 and the 120.3 scale most things are too big and look awkward with my LGB scale.
You gotta goose. If you have a ruler, take your own measurements and compare them yourself to your own satisfaction. The goose is well documented.
May we see a side by side photo?
Not the best pics but will have to suffice for now.
Glue a narrow gauge boxcar on the back of the Climax and see how it looks, I bet it will look out of scale to. Being in Colorado NG for some 40 years, I would say all looks pretty much in scale as it does in real life.
The Climax is a 25 tonner, the prototype measures out to a short 26 feet. Both the Climax and Goose are fairly accurate scale models in 1:20.3.
As a counterpoint, here’s a picture of an SW1500 (itself considered a small road switcher) I’m currently fiddling around with in 1:20.3. Many of the locomotives we run in F scale are tiny prototypes.
My eyeballs calibrate the Climax and Goose #2 as being in the same scale, or so close as to be of no significance. Not likely to double head together, the most likely comingling will simply be one of them sitting in a yard or on a siding as the other passes by. I think they’ll be just fine like that, but if you are concerned that it just doesn’t look quite right, you could alleviate your concerns by simply sending them both to me … I promise not to be any too concerned!
I just have to suffer through, I wouldn’t want to put my misery on you. 
Actually I was just surprised as my mind had an old Buick car vs steam train. But I like both. Just surprised on how large the goose is and it’s the small one, except for goose #1.