Metro protectron

Metro Protectrons are Protectrons found in metro stations that will ask for a Metro Ticket from the player. If you do not happen to have a ticket on your person, the Protection will attack you. After checking your ticket, the Protectron will remain friendly to you, and will walk around the metro station attacking any enemies such as Raiders, Feral Ghouls, etc. It should also be noted that there are similar Protectrons in Super Duper Mart and in the Old Olney sewers that ask for employee ID. The Old Olney Protectron will not, despite its repeated warnings, attack the player. The Metro Protectrons have a different paint job then regular Protectrons-- they resemble a taxi.

If a Metro Protectron encounters Super Mutants, it will repeatedly ask for tickets, causing the supermutants to laugh and mock it (until the Metro Protectron shoots them for "improper metro usage"). While generally fragile, Protectrons make fair allies, especially in the Metro Tunnels, where their laser weapons can often deal with lesser threats such as Feral Ghouls, Molerats, and Radroaches, so it's almost invariably a good idea to carry a Metro Ticket with you.