I have been looking in Amtrak.com at the Grand Canyon (Maswik Lodge) to Flagstaff shuttle connection to the westbound Southwest Chief provided by Groome Transportation. The Chief has a scheduled departure of 8:38 pm from Flagstaff and the shuttle connection arrives at 8:15pm when booking a one-way ticket. I realize the Chief is often late, but if it's on time, that only provides 23 minutes to connect, which leaves no margin for delays with the shuttle. If I use the multi-city booking feature, I see there is a shuttle which arrives in Flagstaff three hours earlier. That would be preferable and allow for a relaxing evening with time for dinner before boarding the train. Has anyone had experience with using this shuttle? Also, if it's booked through Amtrak, should I call Groome Transporation to reconfirm?