Chosen Solution

When I power up my train the tender whistle runs continuously.

Steve Curtis, Sounds like the whistle relay is sticking, you may be able to remove the body and access the relay, take it apart carefully and clean/light lube to get it working. Find below a couple good links. Good luck. I hope this helped you out, if so let me know by pressing the helpful button. http://pictures.olsenstoy.com/cd/whi-tenhttp://cs.trains.com/ctt/f/95/t/142936.a