Need BRASS A&B Diesel ID??

Hi ALL!
I have these 2 Brass pieces, at least I think they are! I got them with other older pieces. I can’t find any markings on any of this stuff. There in a factory stamped “N” on the engine. I know that the bottoms and tops fit together because of the holes. The bodies have this fine mesh blocking the holes. ANY help would be GREAT!

Thanks, TedTrain!

http://mysite.verizon.net/tedbier59/BrassA&B.jpg
http://mysite.verizon.net/tedbier59/BrassA&B1.jpg http://mysite.verizon.net/tedbier59/BrassA&B2.jpg http://mysite.verizon.net/tedbier59/BrassA&B3.jpg

looks like real early Tenshoda Brass by the motor and the style of the cab. They were able to quite get the Bulldog nose correct. Many were sold in A-B sets or even A-B-A sets and shorty passenger cars were also made in brass to match.

Those units are an A-B set of EMD FTs. From the paint they appear to be Erie units.