Here are some explanations, based on the book by historians Michelle
Aubert & Jean-Claude Seguin.
- There's one version of the "train arrival" in the commercial
catalogue, number 653 (= 741 in the numbering used by Aubert & Seguin).
It was shot in summer 1897, according to the age of the children seen in
the film (Joséphine Lumière).
- There are two other versions, "non cataloguées" (not in the commercial
catalogue), that have been found in the Lumière archive by the historians.
- One of those versions was shot in early 1896, as there were 32 stills
used in a newspaper article about Le Cinématographe (published in La
Science française, Paris, n° 59, March 13 1896, p. 89). Possibly, this
version was screened January 25 1896 in Lyon.
- The other unnumbered version was possibly an alternate shot of number
653, as the vegetation is identical.
I hope this helps!