To transport a large number of birds together special mobile carriages were used, the so-called "pigeon lofts". Initially, they were horse-drawn trailers, and later double-decker B-type buses were used as mobile bird shelters, which had now changed scene from the streets of London to the front lines of contact with the enemy on the Western Front.

Some of the two-story vehicles were rebuilt in order to perform their new task; the passenger seats on both levels were removed, the windows on the first floor were shuttered with boards, and the fence on the second floor was replaced by windows, cut out and covered with nets through which birds could fly simultaneously at the required time.