Operation of MTH N6b operating signal man caboose

Back before TMC, Lionel provided a seperate Bell/ Horn switch for those in your situation. Check the bay for one Lionel 6-5904 

Thanks for the suggestion. In checking this out, I found this additional information as shown below. Good to know if anyone else is in this situation. The switch to use is a different one from the 5904 for all but those using a MW transformer. Most operators will want the #10-5906-001, it appears.

Hopefully this will work, but I'll also be interested to try using it in a 18v Lionchief environment.

All Lionel transformers except the Type MW are common ground transformers and can use the #10-5906-001 switch which is different from this switch.

The LionChief remote communicates with the electronics inside the locomotive only. You can’t use it to control other accessories.

You’ll need to get a transformer with both bell and whistle buttons. Plenty out there.

If a one-transformer layout (so as not to need fussing with phasing multiple transformers) could you simply reverse the wires to the track using your conventional transformer?  Then pressing your Whistle button will effect a Bell button.  Presumably you don't need the conventional Whistle function if running LC+.