Editing Loading gauge (section)

==== Passenger service ====
[[File:Gabarit AAR passager.png|thumb|Standard AAR passenger loading gauge (does not accommodate Amtrak "Superliners" nor ex-AT&SF "Hi-Level" cars)]]

The old standard North American [[passenger car (rail)|passenger railcar]] is {{convert|10|ft|6|in|m|2|abbr=on}} wide by {{convert|14|ft|6|in|m|2|abbr=on}} high and measures {{convert|85|ft|0|in|m|2|abbr=on}} [[Headstock (rolling stock)#Length over headstocks|over coupler pulling faces]] with {{convert|59|ft|6|in|m|2|abbr=on}} [[Bogie|truck]] centers, or {{convert|86|ft|0|in|m|2|abbr=on}} over coupler pulling faces with {{convert|60|ft|0|in|m|2|abbr=on}} truck centers. In the 1940s and 1950s, the American passenger car loading gauge was increased to a {{convert|16|ft|6|in|m|2|abbr=on}} height throughout most of the country outside the Northeast, to accommodate [[dome car]]s and later [[Superliner (railcar)|Superliner]]s and other [[Bilevel rail car|bilevel]] commuter trains. Bilevel and Hi-level passenger cars have been in use since the 1950s, and new passenger equipment with a height of {{convert|19|ft|9+1/2|in|m|2|abbr=on}} has been built for use in Alaska and the Canadian Rockies. The [[structure gauge]] of the [[Mount Royal Tunnel]] used to limit the height of bilevel cars to {{convert|14|ft|6|in|m|2}} before it was permanently closed to interchange rail traffic prior to its conversion for the [[Réseau express métropolitain|REM]] rapid transit system.{{Citation needed|date=November 2021}}