Definition of crossrail:
(n) :
(UK, rail transport) A commuter rail line that crosses a major city through a tunnel and which continues for a significant distance into the surrounding areas, generally with relatively high speeds and widely spaced stations compared to an underground or metro.
(n) :
A rail that goes across something.
(n) :
The Elizabeth Line; a railway line in the South of England through London.
(n) :
Alternative letter-case form of crossrail. [A rail that goes across something.]