Hello Christo and Balkan Express, and good afternoon.
Thank you both for your replies.

I have tried to make them as close as possible.
I am willing to upgrade
later on, 2 locomotives:
1. The A301-310 ALCO from the spanish ELECTROTREN.
2. The A501-510 MLW -
original from Christo. A451-470 nad A501-510 -
originals, have the same type of buffer to the prototype.
As we are in a crisis now, I keep money now to concentrate on buying the A501-510 MLW, as this is my basic target, and this would be my first greek locomotive. I already have the couplings and the sprung-buffers. The A301-310 ALCO, I 'll do it later on, as this model may be found from ELECTROTREN easily. The A321-326 ALCO, I won't do it yet.
However, I posted those information for you people, if needed for upgrading.Christo, I will send for everyone the Firma/company that sells those in Germany. It's called WAGENWERK, and it sells fine parts for upgrading your rolling-stock, an all scales, but basically on HO scale.
http://www.wagenwerk.de/h0de/fahrzeugba ... -1949.html,
price: 26euros for 4 sprung-buffers,
Art. Nr.: Günter Weimann FP 14.400.
http://www.wagenwerk.de/h0de/fahrzeugba ... acturer=18, for all the types of sprung-buffers (exaclty to 1: 87 - scale).
http://www.wagenwerk.de/h0de/fahrzeugba ... tiert.html,
price: 14,80euroseuros for 2 x couplings + 2 x springs + 2 x 0,2mm -lenths of wire + 3 x different types of coupling-cases (Kupplungsflansch). One of the types of the latter, is exactly the same for the canadian MLWs and all the 3 types of ALCOs, as I presented on the previous post.
Art. Nr.: Weimann K2.2.
http://www.wagenwerk.de/h0de/fahrzeugba ... acturer=18 - for all the types of couplings (exaclty to 1: 87 - scale). The 2 first, are used and are exactly the same to our old OSE USA: tank wagons, opened wagons, and flat wagons.
I buy from this Firma fein parts from 2009, for upgrading all my rolling-stock.
I will post some more pics of ALCO A321-326 later on.
Thanx
Best and kind regards
Dimitris
P.S. Weimann may make other types of buffers and fine details, that they are exactly the same to our rolling-stock - parts (i.e. buffers). Also, you may check and look other producers of fine details and parts that are sold from the same Firma. No problem.