What it does is you can combine 2 engines to make one big consist so you have more power, the green is the one that you drive and the red one is the dummy that helps with power

oh thanks for the help

why wont it work whiff the calss 17?

how do i use it? i have no idea how to use it

Yeah I got confused on how to use it but the problem is for me is that the master/slave tool that comes with this mod, actually has no assigned buttons to press to make it work... Examples: Left click, Right click, Middle click, or even reload button... For me when I use it it just has no buttons assigned on to how to use it... Like I have other tools such as rope, weld, winch, duplicator, glue etc... It just had no instructions on how to use it like most tools would have listed controls that are visible when using a tool (upper left top corner of your screen)