Good evening ,I had the MTH Pennsylvania Switch Tower or in Pennsy terminology Interlock tower and I weathered it for my winter layout.
To make it look a bit older and covered with cinders from the passing Pennsy steamers I used some watered down craft paint and painted the complete tower.
I removed the interior light and added OGRE LED lights on the inside and above the upper lower entry doors.
Added snow and ice for that winter feel.