Chicago's Metra Electric Line is getting rid of the last of its cash-only ticket kiosks as more passengers choose credit card machines or the Ventra app to buy tickets, according to dnainfo.com.

The Metra Electric Line, the last line to use cash-only kiosks, will get rid of the final machines on April 30, according to Michael Gillis, a spokesman for Metra.

"We have seen steady declines in ticket sales through cash-only vending machines as more customers opt for credit card and mobile purchasing, and it is no longer cost efficient to maintain them," Gillis said.

He said the change will save Metra $534,000 annually by eliminating the need to maintain the 15 machines.

Credit card ticket kiosks are now in 20 stations on the Metra Electric Line.