I emailed George at GHB International earlier today to ask whether or not he had ever produced a model 55 railcar in N scale. So while there’s no possibility of just buying one in N he did have one once in HO so we can add that to the earlier list of ones available for HO scale. For what it’s worth, of the three HO scale options George’s would be my choice.
The model 250 he is referring to is quite similar to the “doodlebug” Bachmann have offered in HO and N scale. While similar to the model 55 I’m looking for it’s significantly different to be not close enough.
GHB did not make the Brill 55 in N scale. It was made in HO. However, GHB did make a Brill 250 gas electric in N scale. I don’t have anymore but sometimes they turn up sale in various places. Sorry, I can’t help.