You have on of the Hastings coaches. If likely had some innovations on it. As Harry always was coming up with new ideas for Newell to add to their coaches, including the Hastings Humpy.
Michael please do tell more.
Who was Mr. Hastings. How many Newell's did he own?
What is his hump?
Check your PM's.
The raised roof over the rear 1/3 of your coach is the Hastings Hump.