A type of overhead service in which the ball is hit hard in a relatively straight line along the penthouse, with spin causing it to bounce back towards the penthouse instead of out into the court.
Origin
Late 19th century.
Definition of railroad service in US English:
railroad service
noun
Real Tennis
A type of overhead service in which the ball is hit hard in a relatively straight line along the penthouse, with spin causing it to bounce back towards the penthouse instead of out into the court.