Adding simple sounds (whistle, maybe bell)

There is always the ERR RailSounds Commander, but it is a little expensive.

The Lionel 8152-50 is very basic, 2 input wire, 2 speaker output wire for a Diesel Horn.

The 8215T-15 is also very basic like the 8152-50, but for steam and therefor has an additional wire for a chuff switch.

The Lionel ISND boards can work as discussed here, but adds volume control wiring:https://ogrforum.com/...g-simple-sound-to-pw

These are getting a little more advanced, but have happy users:

Dalle has a whole product line: https://www.dallee.com/model-train-sound-systems.html

There is the ERR Rail Sounds: http://www.3rdrail.com/err-3rd...lSoundCommander.html

I'm sure there are others as well, but this gives you a reasonable spread of options/directions.

@bmoran4 posted:

The Lionel 8152-50 is very basic, 2 input wire, 2 speaker output wire for a Diesel Horn.

The 8215T-15 is also very basic like the 8152-50, but for steam and therefor has an additional wire for a chuff switch.

The Lionel ISND boards can work as discussed here, but adds volume control wiring:https://ogrforum.com/...g-simple-sound-to-pw

These are getting a little more advanced, but have happy users:

Dalle has a whole product line: https://www.dallee.com/model-train-sound-systems.html

There is the ERR Rail Sounds: http://www.3rdrail.com/err-3rd...lSoundCommander.html

I'm sure there are others as well, but this gives you a reasonable spread of options/directions.

Thanks for the different options. I knew Dalle did reverse units but wasn't aware of their other offerings. Seems like a good way to get sound for around $100.