Whistle Tender Issue

yes I have seen that before the contact is probably sticking together because the contacts are pitted n corroded , you can polish rhe contacts with emery paper or something like that ,otherwise just replace the whistle relay and that will fix your problem 

Alan

The bottom plate on the relay might be magnetized.  I've had that happen a number of times with different relays.  First thing I'd try is to rap the frame of the relay with a small hammer.  If that doesn't work, you can put a piece of Scotch tape on the bottom of the relay plate. If you center it right, the relay will still work, but the tape is enough to break the magnetism.

Roger

ill bet if the whistle relay sticks again and you tap the tender fairly hard with your hand the whistle will stop blowing ok!

Alan

Just a clarification on the tape placement. I looked at one of the relays that I've done that to and I've got the tape across the round copper piece at the bottom of the coil (which is ABOVE the movable bottom relay plate). If magnetism is your problem, that should solve it.

Rpger