Goalkeeper Neil Parry was Albion's hero as Rovers caused an upset in the Petrofac Training Cup with a penalty shoot-out victory over Lanarkshire rivals Airdrie.
Following a 2-2 draw after 90 minutes, the first-round tie went to extra time but there were no further goals and so it went to penalties.
Parry saved Airdrie's first two spot-kicks from Marc Fitzpatrick and Jamie Bain while the League Two side scored all of their penalties to win 4-2.
Liam Watt headed Airdrie into a sixth-minute lead and Keigan Parker had a chance to extend the advantage but his shot from the right side of the six-yard box struck a post. Alistair Love converted Marc McKenzie's cross to equalise before half-time.
Nathan Blockley headed the Diamonds back in front and it looked like it might be the winning goal but John Gemmell's low finish after 87 minutes sent the tie into extra time.