Metro Transit officials say they're making changes to MetroLink gates after riders reported problems with a new ticketing and security system at some stations.

The new system temporarily requires workers to open gates and let ticketed passengers onto the platforms, which has caused riders to miss trains or be locked out of stations, according to members of the advocacy group Citizens for Modern Transit.

On Thursday, the St. Louis region's transit agency announced it would address those problems by keeping gates unlocked if workers have to step away from their posts at the platforms.

Metro has installed the locking gates at 11 of the 38 stations in the system but has not yet put automatic ticket validators or vending machines in place. Until then, security guards must be posted at th

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