Pass Card

Pass cards are items that are randomly dropped by ghouls or centaurs. There are no places where a pass is guaranteed to be found. A ghoul has a 1 in 80 chance of dropping a pass of either color; for a centaur the chance is about 1 in 170. The cards have no purpose.

These items are said to work as metro tickets, one for the red line and the other one for the blue line, when metro Protectrons scan us to find the ticket. The difference is that metro tickets disappear from our inventory. This has not been checked yet, but having one of each in our inventory implies that we can get rid of any metro ticket we find.

In Fallout 1 and 2, Red, Blue, and Yellow pass cards were also used to open corresponding doors, and their presence here may be a nod to the preceding games in the series, Which in turn may be a nod to DOOM, one of the first first person shooter games ever created.