The series of tests is being performed at night at up to about 87 miles per hour without passengers.
Two Coradia iLint prototypes will enter pilot operation in the Elbe-Weser network, with passenger service scheduled for late summer.
All the Coradia Lint DMUs will be manufactured in Salzgitter, Germany, at Alstom’s biggest production site, worldwide.
The delivery is part of an order worth about $198 million.
The diesel multiple units will be built in Alstom’s plant in Salzgitter and delivered by May 2019 to run on the RE Ulm-Aalen, RB Ulm-Langnau, and RB Ulm-Munderkingen lines.
The four-week test runs currently undergoing in Salzgitter aim at confirming the stability of the energy supply system based on coordinated interaction between the drive, the fuel cell, and the battery of the vehicle.
The trains, equipped with Wi-Fi, LED lighting and real-time passenger information systems, provide access for a quick passenger flow.
To date, 137 Regiolis have been delivered to eight French regions.
The new Coradia Lint trains will begin commercial service in Augsburg in late 2018.
With a total seating capacity for 217 people, the vehicles offer increased comfort, with seats featuring individual reading lights and power sockets, dedicated storage space for bicycles and luggage as well as large windows and reduced noise levels.