The phrase "a train rider" is correct and usable in written English.
You can use it to refer to someone who travels by train, typically in contexts related to transportation or travel experiences.
Example: "As a frequent train rider, I appreciate the convenience and comfort of rail travel."
Alternatives: "a train passenger" or "a rail traveler."
The offer is far less complicated for affected A train riders, who were missing much of their line until last spring.
It was conceived as a good-will gesture from Gov. Andrew M. Cuomo to the subway riders whose lines had been disrupted by Hurricane Sandy: Let R train riders in Brooklyn and A train riders from Howard Beach and the Rockaways in Queens travel without paying on Tuesday, the anniversary of the storm.
The four of us rendezvoused at Heinold's First and Last Chance Saloon, a century-old dive bar and Jack London's old haunt, which sits on the Oakland waterfront: There was Jackson, the photographer; Ben, his friend who had a couple of weeks off work and wanted an adventure; and Chris, an itinerant train rider whom I had corresponded with but had never met in person.
Ms. Gates, a regular train rider, initially expected the service to work as smoothly as Wi-Fi on JetBlue or Virgin America airlines, but she has given up on it and bought a wireless card from Sprint.
Remember that shady hobo who hitched rides on freight cars in Dennis The Menace? Find a night train rider guy like that and have him help you plot out how to go about acquiring one of those huge cargo cars.
Aboard an A train on Monday, riders were skeptical of some of the report's findings.
A former PATH train rider, Mr. Shulman takes a ferry from Hoboken, N.J., to get to his office on Nassau Street.
Re "2 Subway Lines Crippled by Fire; Long Repair Seen" (front page, Jan . 25: It's projected that A and C train riders will have to endure years of disrupted service during the slow repair.
The subway system unwittingly aids the cyclists: at the bottom of the hills, both the 181st Street and 190th Street stations of the A train have elevators that allow riders to bypass the grueling climb back up.
