What detail is he implying with the phrase "where the railway station had been"?

There never was a railway station.

War has changed the area.

This is a predictable place to gather.

A train station is like a circus or a village.

War has changed the area.

Explanation:

When we read the phrase "where the railway station had been," we immediately learn that the area is different from how it had been in the past. It is implied that, in the past, there had been a railway station, but that this does not exist anymore. Out of the options, the one that makes the most sense is that the area has changed because of war.

War has changed the area.

Explanation:

The above should be the answer as "where the railway station had been" implies that a railway station used to be here before.