Hello to all
Panagiotis, Yes, the first try to open the casing is very difficult.
I have for the first loco worked 45 minutes.
The loco have the old gearbox but one flywheel
and with (ESU decoder) runs the loco good.
i think the Cast zinc housing (weight) is to wide,
with the file-tool, i file down the sides,
i think the little windows sticks on the green color,
Open the body;
For the first, on the four door sites from casing to splay,
after give on all sites careful small plastic plates ~ 0,1 - 0,2mm,
then in the middle from casing - the tank, splay the two sites from the tank-push down,
give between plastic plates, press the tank down and try to splay on this position the casing.
I hope i could help.

bigger photo
http://www.bilder-upload.eu/show.php?fi ... 610776.jpgbest regards Andy