I also happened upon this RPPC of an American Legion Locomotive Parade in Los Angeles. [c.1938]
eBay
I've never heard of this particular event.
Intrigued: I searched & found one other photograph related to the event in the Pomona Public Library.
pomonapubliclibrary
I couldn't help but notice the 'think-outside-the-box' contraption the legionnaires from Lawrenceburg, Indiana brought to the event.
[see below]
DETAIL
I don't see how, by any the stretch of the imagination, that can be a 'locomotive'...but what they have created, a
Flying Pegasus!, is exceptionally impressive. . .and super cool.
hmm..do you think they drove it like that all the way from Indiana?