Talking about limited room within the interior space of the GG1, the cab was by far the most cramped of any I've been in. I was friendly with a number of engine service employees and was aboard GG1s many times. A visitor was limited to standing in one of the doorways behind the Engineer or Fireman. There was a bulkhead which bisected the cab roof from front to back. Regardless of how careful I was over the years, I still managed to give myself more than one headache by conking the old coconut on it!
Bob