Railking "Proto-One" Hudson-No QSI Sounds

What you may actually have VS what you think you have.

No battery, a speaker, no volume control, a simple On/OFF switch, and a board labeled QSI is most likely a QSI DCRU (DC Reverse Unit) and possibly given the speaker a digital whistle function board.

https://ogrforum.com/topic/83508900588039365

Actual MTH Digital Whistle PCB.

That is VERY different than a PS1 engine with battery and a double stack board set.

Example PS1 board stack set from this topic https://ogrforum.com/...2#161349519307454252

@Joe S posted:

  The only switch on the bottom of the tender is labeled "on-off".  Any instructions as to how to activate, the whistle, bell, chuff, etc. would be much appreciated.

So if it is just the whistle board, you do not have chuffing or other engine sounds, no bell, and ONLY a whistle function and these boards are no longer available if yours is not working.

WHISTLE BOARD
MTH P/N AF-4500005

What you have is an electronic whistle board. The switch on the bottom is the reverse unit lock out switch. MTH's first Rail King steamers from 1995 to early 96 such as the Mohawk, Hudson, and J class Northerns all came from the factory with the electronic whistle. In late 96, MTH offered the 2-board Proto Sound system as an option from the factory. Basically any steam, diesel, and electronic locomotive with -1 at the end of the product number will have proto sounds, with -0 engines having an electronic whistle. QSI who made the reverse units also made sound systems including Proto Sound 1 for mth. Mth and QSI also sold proto sound kits for those who wanted to upgrade their electronic whistles to full digital QSI sounds. They also made accessories such as coil, proto layout sound bloxx units for environmental sounds, and proto freight sound units for boxcars and stock cars.