A category or classification to group data points that doent fit neatly into predefined or standard categories, often used for values or entries that are uncommon or don't conform to the expected set of categories.

Diesel carbon is bound together with polymeric lubricant resins and form particles with pumice-like, granular, or flaky appearence which is often sooty or oily.

RR: Process of treating or removing flamable vegetation from the Railroad Right-of-Way (ROW).
Debris/open burning: Use of fire to clear vegetation, debris and brush within a right-of-way.

When a dynamic brake is applied, the traction motors convert to generators which produe electrical current that is routed to a resistor grid on the locamotive. This resistor grid resembles a larg toaster element and its location on an engive varies but is typically vented out the top of the locomotive car body.

Process usually done with a maintenance of way vehicle or train to restore the profile and remove irregularities from worn tracks.

Replacement of railroad tracks or ties. Can be done with hand crews or a track renewal train.

A mechanical system used to slow down, stop or control the motion of a moving object by applying friction or force.

An airplane, helicopter, or other machine capable of flight.

A prescribed fire that has exceeded or is expected to exceed prescription parameters or otherwise meets the criteria for conversion to wildfire.

At common law, the malicious and willful burning of another's dwelling, outhouse, or parcel; by most modern statutes, the intentional or wrongful burin gof someone else's, orone's own property. Frequently requires proof of malicious or wrongful intent.