https://en.wikipedia.org/wiki/Airport_rail_link
https://en.wikipedia.org/wiki/Airport_rail_link#Connection_types
https://en.wikipedia.org/wiki/Airport_rail_link#High-speed_rail_and_inter-city_rail
https://en.wikipedia.org/wiki/Airport_rail_link#Regional_rail_and_commuter_rail
The Canada+Line is such a sad and pathetic joke. Nevermind planning for a 10 car train linking YVR with the Horseshoe+Bay+ferry+terminal and the Tsawwassen+ferry+terminal to YVR, BC opted for a half-assed little train. Apparently, its logical in backwards BC to not allow for future clearance to at least have a 5 car train connecting YVR with West Vancouver & Delta. It was difficult enough just to have a small 2 car train & eventually a 2.5 car train between Vancouver & Richmond.
https://en.wikipedia.org/wiki/SeaTac/Airport_station While Seattle can have a 2 car short train, the SeaTac_Airport_Station was designed to accommodate a proper big city long train.
Unlike in backwards BC, the Seattle_Central_Link Airport Station has 2 tracks. https://upload.wikimedia.org/wikipedia/commons/2/26/SeaTac_light_rail_station_from_airport_parking_garage_%282010%29.jpg Most proper cities around the world plan & build big infrastructure or at least allow for future expansion clearence.
https://en.wikipedia.org/wiki/SeaTac/Airport_station#Station_layout
https://en.wikipedia.org/wiki/RER_B#List_of_RER_B_stations
https://en.wikipedia.org/wiki/Leonardo_Express
https://en.wikipedia.org/wiki/Jazz_(Italian_EMU)
https://en.wikipedia.org/wiki/San_Francisco_International_Airport_station
https://www.bart.gov/stations/sfia https://www.bart.gov/guide/airport/sfo
