The MBTA's new program aimed at cracking down on fare evasion began around Boston Monday. Riders who try to ride for free could face fines up to $100.

The program was announced last month as the MBTA said it would be adding specially trained "fare engagement representatives" on trains and at T stations throughout the system.

Workers in blue shirts and khakis will be checking to make sure that riders pay as they go through the gates. The MBTA representatives will have handheld devices to scan proof of payment.

According to the MBTA, fare evasion costs tens of millions of dollars a year and the new system is meant to cut into those losses.

"Fare revenue supports an integral part of the MBTA's budget," said Elizabeth Winters Ronaldson, deputy chief of fare revenue for the MBTA. "Pre-COVID, the MBTA generated about $670 million a year in fare revenue. Last year, the MBTA collected $440 in fare revenue. The money that fare revenue generates supports things like wages, improved service, maintenance and cleaning, and supports the MBTA that we all rely on."  

Riders who are unable to show proof of payment could face penalties. The first time a violator is caught, they will receive a warning. After that, the fine is $50. The fine doubles to $100 for anyone caught four times or more.

Many people who ride the MBTA told WBZ-TV that fare evasion is something they see on a regular basis and that they would support the crackdown if it could improve service.

"If there's going to be a hefty fine involved potentially, I know that's very common in every European city I've traveled to, so definitely would be more inclined to pay the $2.50 or whatever fare than get a $100 ticket," Green Line rider Walker Davey said. 

"I think if they can save money and use that money for other purposes that we need, I think go for it," Susan Cantos said.  

Electronic fare gates were recently added at South Station to help make sure riders are paying.

Riders are able to pay for the train and buses with their phone, a contactless card, cash, a ticket, or a CharlieCard.    

Aaron Parseghian contributed to this report.