Editing Loading gauge (section)

==== New York City Subway ====
The [[New York City Subway]] is an amalgamation of three former constituent companies, and while all are [[standard gauge]], inconsistencies in loading gauge prevent cars from the former [[Brooklyn–Manhattan Transit Corporation|BMT]] and [[Independent Subway System|IND]] systems ([[B Division (New York City Subway)|B Division]]) from running on the lines of the former [[Interborough Rapid Transit Company|IRT]] system ([[A Division (New York City Subway)|A Division]]), and vice versa. This is mainly because IRT tunnels and stations are approximately {{convert|1|ft|mm|0}} narrower than the others, meaning that IRT cars running on the BMT or IND lines would have [[platform gap]]s of over {{convert|8|in|mm|0}} between the train and some platforms, whereas BMT and IND cars would not even fit into an IRT station without hitting the platform edge. Taking this into account, all maintenance vehicles are built to IRT loading gauge so that they can be operated over the entire network, and employees are responsible for [[mind the gap|minding the gap]].

Another inconsistency is the maximum permissible railcar length. Cars in the former IRT system are {{convert|51|ft|m|2}} {{as of|2013|12|lc=y}}. Railcars in the former BMT and IND can be longer: on the former [[Rapid transit operations of the BRT and BMT#Divisions|Eastern Division]], the cars are limited to {{convert|60|ft|m|2}}, while on the rest of the BMT and IND lines plus the [[Staten Island Railway]] (which uses modified IND stock) the cars may be as long as {{convert|75|ft|m|2}}.<ref>{{cite web |title=NYC Fun Facts: Not All NYC Subway Trains Are the Same Size |url=https://untappedcities.com/2017/08/02/nyc-fun-facts-subway-tracks-have-different-widths-in-nyc/ |website=Untapped Cities |access-date=11 July 2018 |date=2 August 2017}}</ref><ref>[[Second Avenue Subway]] [http://web.mta.info/capital/sas_docs/sdeis.htm Draft Environmental Impact Statement], {{cite web|url= http://web.mta.info/capital/sas_docs/sdeis/glossary.pdf |title=Glossary }}&nbsp;{{small|(45.6&nbsp;[[Kibibyte|KiB]])}}</ref>