They didn’t have to do anything to the hoses. They were the same on standard and narrow gauges, so they’d attach together just fine. The brake rods on the standard gauge car attached to the brake rigging on the truck itself through a clevis and pin arrangement, so when the crews dropped the trucks, they merely pulled the pin on the clevis that attached the brake rod to the rigging on the standard gauge truck. When they rolled the narrow gauge truck back underneath the standard gauge car, they attached the brake rod to the rigging on the narrow gauge truck.
In response to the original question, I model narrow gauge (East Broad Top) because I’ve just always been fond of narrow gauge railroading. I’ve always liked the uniqueness that surrounds narrow gauge railroads–no two were alike, and each seemed to do things their own way, which makes modeling them fun because if you want to build something quirky, there’s plenty of fodder for ideas.
I do enjoy standard gauge railroading, but I think it takes a certain kind of railroad for modern mainline trains to “look right” in a back yard setting. If I were to do standard gauge, I’d still probably model a short line with smaller locos and short trains.
Later,
K