Darby enjoyed a hugely successful club career as a
dual player with
Trim. In 1962 he captained the team from full-back to their only
Keegan Cup triumph, while he also won five
Meath SHC titles. After a period with the Meath minor team, Darby made his
senior team debut as a 19-year-old against
Dublin in 1958. He was one of the key figures on the team that made a breakthrough and won the
Leinster Championship in 1964. Darby was at left corner-back for the
All-Ireland final defeat by
Galway. He was named captain of the team the following year and was again at left corner-back when Meath beat
Cork in the
1967 All-Ireland final. ==Post playing career==