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2.
In gaming, the act of forcing a player to "choose to" do something they don't really want to in order to advance the plot according to the wishes or designs of the GM.

Thus, the player feels like they're being moved through a world (or plot) as if on train tracks, without any choice on where to go.
"So we have to search the lower dungeon to find the key, despite the fact that this door is rotten and my character has 19 strength? Stop railroading us!"
by FeepingCreature March 09, 2013
 
1.
A term describing the process of forcing the player characters in a Role-Playing Game to complete a certain task before continuing the adventure.
"The GM has subtely instructed us to go to this town before we can finish the damn story. I bet he received a Masters Degree in Railroading."
by InsanityIsCrazy November 14, 2004