After three years of construction, the TTC will open its second platform at Union Station in time for the Monday commute.

It’s a milestone in the $137.5-million renovation at the busy station, which has one of the narrowest platforms in the system.

Subway service will be down between Union and St. Andrew on the weekend as crews finalize the new platform that will change the way riders use the Union Station stop and provide more breathing room while waiting to board the trains.

Commuters sleepwalking through the Monday morning ride should be warned that they’ll need to watch the new signs to ensure they stand on the correct platform.

Instead of boarding both ways off a single centre platform, riders will use the new platform on the south side of the station to head north on the Yonge line. The existing platform will be used to board trains travelling up the University side of the subway loop.

The TTC is laying on extra customer service on Monday and holding a meet-the-manager with the top brass at Union between 7 and 9 a.m.

The platform opening doesn’t mark the end of the Union Station renovation, however. The existing platform still needs repairs and the station concourse still won’t be finished until spring. Front St. is supposed to reopen in December.

“The new station design provides easier access to the PATH, which can be accessed using the west bypass or the reopened east bypass through Brookfield Place,” said TTC spokesman Brad Ross.

More than a quarter million commuters, including about 115,000 TTC riders, travel through Union Station every day, making it the busiest transportation hub in the country.

Although the TTC renovation remains on time and on budget, there have been delays in construction on the other parts of the station renewal, which also involves GO Transit, Via Rail and the city of Toronto.

The $795-million total cost is being funded by all three levels of government.

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