Gearing up for the Belle Isle Grand Prix this weekend, General Motors invited some of the Chevrolet and Cadillac racecar drivers out to its Detroit-Hamtramck assembly plant. While there, the racers – including IndyCar Driver and Chevrolet Volt owner, Simona De Silvestro – witnessed the very first 2014 Cadillac ELR to roll off the assembly line.

These vehicles are not destined for customers, however, but instead they are pre-production units that will be used by engineers for testing purposes. Actual production of ELR consumer models is expected to commence closer to the end of this year. As a refresher, this range-extended electric Cadillac shares much of its powertrain with the Volt but will have a sportier coupe design inspired by the Converj Concept. De Silvestro manged to snap a few images of her own, which you can see in the gallery below.