Adding wipers to locomotives
 

I was wondering can you help me how to add wipers to a locomotive that's without wipers

That's impossible without the source-file of a loco. Wipers (like all attached animated details) are attaching to the main shape through the hierarchic tree (see model in Shape Viewer - View Hierarchy).

what's the source-file

well how can I attach new things to that tree

[QUOTE=Kaloyan Kotlarski;61403]what's the source-file[/QUOTE]

Source is 3D shape created in 3D modelling program (for example 3DS Max)

If you don't have source shape (only model's author have usually), you still can attach additional details to the loco or wagon.
It's quite simple - you create new detail (like antenna, wipers or hand rails), and
add it to model using freightanim tag in the eng/wag file

for example: this line adds additional shape "msts_pass-21_bort.s" to the man wagon shape

FreightAnim ( msts_pass-21_bort.s 0.01 1 )

This tag can't add an animated mesh - only static details. To add animated wipers, pantogpaphs an so on 3d-modelling practice is needed.

[QUOTE=Skif;62395]This tag can't add an animated mesh - only static details. To add animated wipers, pantogpaphs an so on 3d-modelling practice is needed.[/QUOTE]

I know, but for decorating purposes that's enough