CHIEF BAKER: [into a walkie talkie] We’ve got the first engine laddering the roof, first engine. Yeah, and we need PD for traffic control.
PD stands for Police Department. In real life, there is a State Police Station in Litchfield, which is said to be very close to Stars Hollow.
We’re now in the second part of the episode title, which promises fire as well as Poes.
The Annotated Gilmore Girls 