It wasn't something I knew about. I was looking through a book about LNER named locomotives and came across this list of the D11/2s. The names made me chuckle, and after doing the Rab C. Nesbitt Class 320 out of Glagow and finding that the D11/2s were based at Edinburgh, it just felt right to attach the name to a Haymarket based loco or unit, so I opted for the 150/2.
