UPDATE 13 November 2014
Oppie has released a new version with the correct LUA script. It should work now.
I found out that oppie's DE'3 download lacks the correct LUA script, and without it, the DE 3 model will not appear in game.
I have already told oppie about it but I think I am not the only one that has done so.
Here is a hotfix to get the train in game.
Anyway, to add the required LUA script yourself until oppie has an updated version:
Extract the DE3 mod in a folder (e.g. desktop), and then go to "Res/Config/Multiple_Unit"
Delete the existing LUA scripts, which are called ns_planT.lua and PlanV.lua
In notepad (or preferably notepad ++) make a new document
Copy and paste the code below in the new file
function data()return { vehicles = { { name = "vehicle/train/ns_DE3_3.mdl", forward = true }, { name = "vehicle/train/ns_DE3_2.mdl", forward = true }, { name = "vehicle/train/ns_DE3_1.mdl", forward = true }, }, name = _("NS Mat '34 \"DE3\""), desc = _( "DE 3 by oppie")}end
5. Save the text file as 'NS_DE3.lua' in the folder mentioned above.
6. Place the "Res" folder and "tfmm.ini" file in a compressed ZIP or RAR folder
7. Use Train Fever Mod manager to enable the mod.
The mod should work correctly now.
IMPORTANT, USE CAUTION!
NOTE: I'm not sure how this affects the Mat 64 mod, it might need reinstalling
NOTE 2: You are manually adding the LUA file to make the DE3 mod work in game. I am not sure how this affects your savegames after you have uninstalled the hotfix and reinstall using oppies updated version.
NOTE 3: This tip is provided without warranty, so use caution.
NOTE 4: If you intend to use the DE3 in your save game permanently, it might be better to wait for oppies fix rather than do it yourself, to ensure compatibility with future versions.