Flanders mud flaps, post WW1 use.

[muffett.2008]

Note that the "trainer" is about to run a model train with targets downrange! Moving target practice. How often did they have to replace cars?

Bob

Bob, the train and carriages were obscured down range, only the targets were exposed.
This system was in use at Singleton in 1966/67 at 3RTB, but the system was upgraded to a full CINIE Range by the time I was back in 1970.