There's calls for the NCT operator to reverse a decision to go cashless.
Applus announced it will only accept digital transactions or postal orders for what it called the "safety and convenience" of customers.
But Aontu leader Peadar Toibin says the decision isn't inclusive:
"it's a terrible decision by the NCT and it should be reversed," he said.
"Cash is the most inclusive way to pay for items.
"It means that people - no matter what their age or their skill level, no matter if they've access to the internet or smartphones - that they have the ability to participate fully in society.
"Cash is recognised to be crucial, especially for the inclusion of vulnerable citizens".
"The many older people who can't use smartphones or don't have access to the internet, for example, would have to ask their children for help or ask their neighbours for help.
"When a person is older what we want to do is actually strengthen their autonomy, to strengthen their independence.
"By getting rid of cash, this has the opposite effect."