Paul Farquhar
Legend
Firstly, there are really two types of things people mean when they talk about a railroad. One is bad and the other is invisible. The bad kind is when the players have no agency. They must encounter a set series of events in a set pattern, if they try to do anything else the DM blocks them.How do they differ?
The other is when the fixed points follow naturally (many people would not call this a railroad, but some would). Successive rooms in a dungeon is the obvious example, but the plot points in Castle Amber are to - it would simply make no sense for events to play out in a different order.