It's normal-sized domestic cats attacking model trains, though the cats look huge in comparison.
Do you want to take this train? Ⅰ - YouTube
Do you still want to ride this train? X It will be a long ride. - YouTube
日曜日のジオラマ食堂!Sunday's diorama restaurant was a blast with customers and cats! Thank you very much! - YouTube
at channel
Diorama Shokudo -Dioramas and Cats - YouTube
Enormous Cat or Tiny Train? Feline Takes Stroll on Owner's Train Set - YouTube
Katze vs. Gartenbahn III - YouTube (Cat vs. Garden Railroad III)
Mutzerbahn - "Cat-aclysm" in Such station, waiting for a model train to come. - YouTube
1.2: Model Train Scale and Gauge - Railroad Model Craftsman
Common scales: Z: 1:220, N: 1:160, HO: 1:87, S: 1:64, O: 1:48, G: 1:25
How big is a cats paw? - Answers - cat paw width: 3.5 cm (1 1/2 in)
Scaled upward: Z 7.7 m, N 5.6 m, HO 3.045, S: 2.24 m, O: 1.68 m, G: 0.875 m -- standard gauge is 1.435 m
So HO is about right for the first one.
Do you want to take this train? Ⅰ - YouTube
Do you still want to ride this train? X It will be a long ride. - YouTube
日曜日のジオラマ食堂!Sunday's diorama restaurant was a blast with customers and cats! Thank you very much! - YouTube
at channel
Diorama Shokudo -Dioramas and Cats - YouTube
Enormous Cat or Tiny Train? Feline Takes Stroll on Owner's Train Set - YouTube
Katze vs. Gartenbahn III - YouTube (Cat vs. Garden Railroad III)
Mutzerbahn - "Cat-aclysm" in Such station, waiting for a model train to come. - YouTube
1.2: Model Train Scale and Gauge - Railroad Model Craftsman
Common scales: Z: 1:220, N: 1:160, HO: 1:87, S: 1:64, O: 1:48, G: 1:25
How big is a cats paw? - Answers - cat paw width: 3.5 cm (1 1/2 in)
Scaled upward: Z 7.7 m, N 5.6 m, HO 3.045, S: 2.24 m, O: 1.68 m, G: 0.875 m -- standard gauge is 1.435 m
So HO is about right for the first one.