Final answer:
Train otaku have a reserved affection for trains and train-related activities, rooted in the cultural significance of trains in Japan and their fascination with the technical aspects of trains.
Step-by-step explanation:
In comparison to the fantasy worlds of anime, manga, and games, train otaku have a reserved affection for trains and train-related activities. Train enthusiasts, commonly known as train otaku in Japan, are passionate about various aspects of trains including train models, train photography, train history, and train operations. They often engage in activities such as visiting train museums, attending train exhibitions, and collecting train memorabilia. Train otaku's interest in trains is deeply rooted in the cultural significance of trains in Japan and their fascination with the technical aspects of trains.