All About Aurora Postage Stamp Trains
Box size: 3-1/2" x 6-1/4" x 1"
Faller later renumbered the kit 232427. It's unclear if the kit contained both houses, given that one is nearly cropped out of the photo.
More recently, Faller (unambiguously) offered one of the two homes as 232507.
Postage Stamp Trains is a Trademark of the Aurora Plastics Corporation.