The South Shore Line will be testing a new safety system on Monday.

Riders on the trains will notice fewer cars on some runs while the new computerized system is checked out. The Chicago Tribune says the system is designed to automatically slow and stop a train if the engineer fails to take action.

It’s part of an industry reaction to crashes like the December incident in Washington State that killed three people when a train hit a curve at nearly 50 miles per hour over the speed limit.

The South Shore is installing Positive Train Control, or PTC, on all 72 of the railroad’s motorized cars and all 75 miles of track it owns in Indiana.

A fare increase is one of the options being discussed to help pay for the $100 million improvement, which is mandated by the Federal Railroad Administration.