I have several Lionel 153 semaphores connected to 022 switches and red/green lights on both units synch just fine. I attempted to do the same with a semaphore and an OLR switch (basically a K Line switch), but problems occurred. I first connected the middle of the 3 terminals on each unit together, but when I connect either of the outer terminals on the semaphore with either of the outer terminals on the switch, either I get no light at all or the switch hums, almost like there is a short. The semaphore works just fine when tested directly to a power source. All switches run on dedicated power circuit, not track power, and this switch works fine. I know the controllers on the OLR switches are not as simple as those for 022 switches - they have a small circuit board, but I did not think connecting the switch to a semaphore would create problems. Any suggestions?