- ALDP
- Accelerated Leadership Development Program
- ARA
- Australasian Railway Association
- ASL
- Acceptable Service Level
- CAT
- Central Area Transit
- CIS
- Customer Information System
- CNG
- Compressed Natural Gas
- CRM
- Composite Rate Model
- CUC
- Capital User Charge
- DAIP
- Disability Access and Inclusion Plan
- EGR
- Eastern Goldfields Railway
- FTZ
- Free Transit Zone
- GPS
- Global Positioning System
- HSE
- Health, Safety and Environment
- LTI
- Lost Time Injury
- N&I
- Network and Infrastructure (PTA division)
- NMR
- New MetroRail (former PTA division)
- OPSSC
- Office of the Public Sector Standards Commissioner
- ORS
- Office of Rail Safety
- OSH
- Occupational Safety and Health
- OTR
- On-time running
- PDP
- Performance and Development Plan
- POD
- People and Organisational Development (PTA division)
- PSA
- Property Street Addresses
- PSM
- Passenger Satisfaction Monitor
- PTA
- Public Transport Authority of Western Australia
- QEII
- Queen Elizabeth II Medical Centre
- RAPID
- Recording and Passenger Dissemination System
- RCCTS
- Rockingham City Centre Transit System
- RTO
- Registered Training Organisation
- SBS
- School Bus Services (PTA branch)
- STAR
- Stop Think Assess Respond
- TOD
- Transit Oriented Development
- TRIS
- Transperth Route Information System
- TTO
- Transperth Train Operations (PTA division)
- TVM
- Ticket-Vending Machine
- UWA
- University of Western Australia
- WAGRC
- West Australian Government Railways Commission (PTA predecessor)
- WAP
- Wireless Application Protocol
- Acceptable Service Level (ASL)
- Is defined as an hourly service during the day with at least three trips, i.e. at 20-minute intervals, in the peak flow direction in the morning and afternoon peaks.
- Category A
- Incident causing serious injury, death, or significant damage.
- Category B
- Incident that may have the potential to cause a serious accident.
- Circle Route
- A high frequency bus service connecting major shopping centres, universities, schools and colleges.
- Fare-paying boardings
- Covers only those people, standard fare or concession, who pay (either by tagging on or by the purchase of a cash ticket) as they enter the system.
- Initial boardings
- Fare-paying boardings, plus free travel on passes, free travel on CAT services in Perth, Fremantle and Joondalup and free travel on services within the Perth FTZ.
- Passenger place kilometres
- The average seat capacity multiplied by the kilometres travelled while in service.
- Service kilometres
- The kilometres travelled while in service.
- Total boardings
- Fare-paying boardings, plus free travel on passes, free travel on CAT services in Perth, Fremantle and Joondalup and free travel on services within the Perth FTZ, plus transfers between services.