General Motors review: Delivery delay and insufficient communication

We ordered a GMC Canyon on 7 April with an estimated delivery of 8 - 12 weeks from the dealer. I was encouraged by a message from the dealer that the vehicle build was complete on 16 May and to expect updates on shipping status. It is now over 17 weeks since the truck order and it’s yet to be delivered. The only communications from GM in this 17 weeks have been, 4/19 - order placed, 4/26 - being built, 5/29 - making it professional grade, 7/7 - on the move. Other than the first GM communication, the later 3 have not provided details to assess status nor estimated delivery. The information available to the dealer has also been limited. The dealer was only able to discern that the vehicle was at the manufacturing site in Wentzville, MO from the time it was built to when it shipped from there by rail on 16 July. So it sat at the production site for 7 weeks with no information provided to me or the dealer on when it would ship. In the past 5 weeks, the dealer tells me it remains stuck on a rail car with 17 other GM vehicles destined for this dealership. No communication from GM has been received identifying this status nor any indication of effort undertaken to resolve the issue at the rail yard. The continued delays have left us stranded without a vehicle and we’ve begun looking for a replacement. The lack of communication from GM on status has left us questioning GM commitment to customer service.