List of vehicles in which the "universals" work and detailed functions which they perform. Universal (number) 1 and 2 don't work in debug mode.

181_v1universal3: gauge lights
303e_v1universal1: window; universal2: door; universal3: gauge lights
4e_v14e, 4e-ep-tv, 4e-ep-zez, 4e-tv: universal1: window; universal2: dor; universal3: gauge lights
4e-ep, 4e-zez: universal1: sun shade; universal2: window; universal3: gauge lights
6dg_v1universal3: gauge lights,
IMPORTANT Shift + < - turn on the onboard computer
br285_v1universal3: gauge lights,
IMPORTANT Shift + < - turn on the onboard computer, Shift + > - turn on the radio backlight
ed72_v1universal2: window; universal3: gauge lightsw
en57_v1universal3: gauge lights
en57-2000_v1universal3: gauge lights
ep05_v2universal2: window, universal3: gauge lights
ep07_v1universal1: left window, universal2: right window, universal3: gauge lights
ep09_v1104e_2, 104e_3: universal2: sun shade, universal3: gauge lights
et22_v2universal1: sun shade, universal2: window, universal3: gauge lights
et22-2000_v2universal2: gauge lights, universal3: computer screen
et40_v1universal2: window
et41_v1universal1: door, universal2: window, universal3: gauge lights
et42_v2universal1: sun shade, universal2: window, universal3: gauge lights
IMPORTANT Shift + > - Turn on the controls(speedometer, lights)
eu04_v1universal1: right door's windowo, universal2: left door's window, universal3: gauge lights, universal4: hand brake handle
eu05_v2universal2: window, universal3: gauge lights
m62_mod_v1universal3: radio backlight
sm03_v1universal3: gauge lights
sm40_v1universal2: right window
sm41_v1universal2: right window
sm42_v1universal3: gauge lights, universal4: fan
sp42_v1universal3: gauge lights, universal4: fan
su45_v2universal1: sun shade, universal3: gauge lights, universal4: fan
st45_v1universal1: left sun shade, universal2: right sun shade, universal3: gauge lights, universal4: fan
su46_v2universal1: sun shade, universal2: window, universal3: gauge lights, universal4: fan
tem2_v2universal3: gauge lights
tem2u_v2universal3: gauge lights

Extract from Key Functions - just in case:

Key Function Note / Comment
Shift + [ Turn on universal 1 Doesn't work in debugmode!
[ Turn off universal 1 Doesn't work in debugmode!
Shift + ] Turn on universal 2 Doesn't work in debugmode!
] Turn off universal 2 Doesn't work in debugmode!
Shift + ; Turn on universal 3 -
; Turn off universal 3 -
Shift + ' Turn on universal 4 -
' Turn off universal 4 -

Additionally, in the m62_mod_v1 and sm42_v1 locomotives, music can be turned on using Shift + , keys . It CAN'T be turned off!

List author: libertyn89.
Update: Maciej.
English translation: kolejarz2009