Glossary

Term	Description
Train	Refers to a vehicle schedule - the daily assignment for an individual bus. A block consists of an ordered list of all trips handled by the vehicle from pull-in to pull-out. A train can have one or more runs assigned to it.
Run	A driver schedule is known as a "run." It refers to a driver's daily work assignment. Multiple runs can work a single train/block. Runs can consist of two blocks (a split shift). A driver's schedule is primarily determined for each sign-up period through the run-cut process where bus schedules are integrated with driver assignments.
Trip	Consists of a set of points along a line and pattern ordered by departure time (from each time-point) and oriented by direction. Inbound/Outbound and outer terminal to inner terminal, etc.
Pattern	Subset of a line/route.
Stop	An authorized location for a bus to stop on a route.
Time-point	Refers to a location on a bus route assigned a fixed scheduled time that is part of a larger line schedule.
Loop	Refers to a portion of a bus line/route where the driver operates a segment in one direction only. Passengers may only board on one side of the loop. Loops are sometimes required due to lack of pavement accessibility, or when no off street turn-around is available.
Deadhead operation	Refers to non-revenue time when a bus is not carrying passengers, usually a trip from, to, or between lines or garages.
Headway	Refers to time intervals between vehicles moving in the same direction on a particular route. Headway can change on a line during the day as rider demand changes.
Frequency	Refers to the quantity of service on a route, usually described in terms of the number of buses per hour or the elapsed time between consecutive buses. The latter measure is also called the headway. The term high frequency denotes many buses per hour, or small headways.
Service	All possible service types that may exist for a sign-up period (Weekday, Saturday, Sunday, Holiday, local, limited and/or express trips, etc.)
Articulated Bus (or just "Bus")	A bus usually 55 feet or more in length with two connected passenger compartments that bend at a connecting point.
Trolley Bus	An electric, rubber-tired transit vehicle, manually steered, propelled by a motor drawing current through overhead wires from a central power source not on board the vehicle. Also known as "trolley coach" or "trackless trolley."
Run Time	Expected interval from one time point to another