Last year, 87.4 million riders took the commuter railroad - the highest since 1949.
The hand-cancelling is scheduled from 8 a.m to 1 p.m. on Friday at the 34th Street entrance. There's no charge for the service.
Pre-stamped vintage envelopes will be available at $2 each, with the funds going to three transit museums in New York.
NEW YORK AND TRI-STATE AREA NEWS
USEFUL LINKS: