The request was often heard on Melbourne's trams. It is not now. There isn't a conductor to help. Mostly passengers assist each other and as a last resort they may get some begrudging assistance from the driver.
Are conductors on Melbourne's trams a luxury that we can afford? They would reduce fare evasion to a negligble level. But they would probably cost more than they saved in lost fares.
How many Cusotomer Service Officers and Revenue Protection Officers are there? Maybe close to one hundred? Well then there is already a decent number of staff.
When would they be most needed? At night time for security? Daytime to assist older passengers? Weekends to help tourists and casual travellers? Peak time to counter fare evasion? All the time perhaps? Is this really affordable?
I don't know, I really don't. But if there was a simple and easy to understand and use ticket system, there would be much less call for conductors.