I've had the same problem, oddly enough if you start the horn inside the cab and then switch to an exterior view it works fine.
So here's a list of problems ive observed PIS boards sometimes don't work with the 146 regardless of the route High beams permanently stuck on...
Im on PC. Same issue, this is also apparent on the Munich route as well. Only on the Dosto, however
I've noticed all trailing DB766 wagons have headlights and taillights on with no way to disable headlights. Occurs when you are driving as well
I've had this issue on pretty much every route with the 146
[ATTACH] Train: EMD GP38-2 Route: Canadian National Oakville Subdivision
[ATTACH] Route: Northern-Trans Pennine Train: BR Class 101 and BR Class 40
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