geeps wrote:You may want to post in the Toy Train forum.
It's a Lionel selenoid switch that is sticking. It's getting AC power - that's why it is buzzing.
Is it worth repairing? Open up, lube, and re-rivet. It's probably a rusted iron slug wrapped in a wire coil. When it stops buzzing - you're in trouble. The coil is shot.
DONT hold the swich lever down too long.Most coils don't like 16 Volts AC.