Siemens has commenced tests with its SC-44 Charger diesel locomotives at the Transportation Technology question has the number 4601 and is destined for the Illinois Department of Transportation (IDOT) to which it will be delivered later this year. At Pueblo, a variety of tests and validation exercises are performed, including test runs up to 200km/h (125mph), acceleration and braking tests and testing of the overall performance capabilities. The tests are performed with four Kawasaki built MARC III double-deck coaches that are temporary on loan from MARC (Maryland Area Regional Commuter).