Whats the best track guage to use?
Generally, 15″ guage is about the smallest guage practical for two-abreast seating, although it is possible to use a smaller guage. Even 24″ guage cars can be pretty tight. Anything much smaller than 15″ becomes unstable due to the passengers’ weight raising the train’s center of gravity. Passenger comfort is another issue — if you expect to carry adults, stick to 15″ guage or larger.