Pretty sure that PSAs don't do revenue. They are there for customer service/safety and driving when needed to amongst other duties.
KEY ACCOUNTABILITIES:
*Enforce safety rules and regulations and carry out necessary procedures in the event of an emergency occurring, to ensure the safety of members of the public and employees of the railway. All staff are responsible for reporting all incidents, including providing written reports
*Operate trains in automatic or manual mode as required to meet schedules and to achieve weekly targets for service levels
*Carry out Crowd Control duties at specified times and locations to facilitate movement of customers in a safe and efficient manner.
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*Inspect tickets and oyster cards on trains and stations and when required take action to collect penalty fares in order to maximise revenue and minimise fare evasion. Revenue duties include using ticket checking devices to maximum effect
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*Provide information to customers using public address systems, personal contact or published brochures, to assist them in understanding fares, journeys and other services provided by the railway. Responsible for protecting company revenues at all times
*Carry out routine fault finding techniques on vehicles and report results to assist technicians in vehicle maintenance and repair
*Render all possible assistance to customers, in particular those with special needs, to enhance customer service and safety
*Report any maintenance or cleaning issues both on trains and stations whilst carrying out duties to the Control Centre
*The Passenger Service Agent represents the front line of the railway through their operation of trains and direct contact with customers. They are a primary link between what is happening on the front line and the Control Centre, which has the overall view of the railway.
*The Passenger Service Agents are trained in the rules and regulations for normal and emergency operation of the railway. They are required to apply these appropriately as the situations arise. They are in radio contact with the Control Centre and the Control Centre Controllers and Control Room Technicians are available to provide advice.
*Passenger Service Agents are rostered to specific duties. Department Managers monitor their performance, with additional input from Service Team Leaders and Patrol Team Leaders.
I hope this helps.