Dan,
In addition to the shorting problem with these switches noted in another thread (and solved with electrical tape), I have had the same problem with some locos losing power on the switch (either too much or too little power!!). As noted by John (Bluecomet400) above, there is a faulty contact with some of the rails. I tried to stick bits of aluminum foil in the gap as a bridge, then noticed that if you slide the rail to make a tight contact, that solved the problem. Of course, a solder link is more permanent. And yes, these OLR, K Line, and RMT switches are identical, just boxed differently.
Hope this helps.
Michael