Final answer:
There are 19 adults on the train, and 7 of them are women. The number of men on the train can be found by subtracting the number of women from the total number of adults, which is 12.
Step-by-step explanation:
To find the number of men on the train, we need to subtract the number of women (7) from the total number of adults (19).
Therefore, the number of men on the train is 19 - 7 = 12.