There is a CP Rail corridor through the city and at one point long ago the CP Rail's North Toronto Station, now an LCBO just south of Summerhill subway station, was a place people could catch trains to places across CP's Ontario network reaching as far as Detroit and Montreal.  The station however couldn't match the convenience of Toronto's Union Station and still can't to this day.   

With the Crosstown Line on Eglinton just about to open and with all the other network enhancements that will make the area easier to get to, there isn't an immediate need to cover the expense of moving CP's freight line north of the city to free up this line for passenger use.  However, things will not stay the same and while Union Station may be more convenient to connect through and closer to where more people want to go today, it's capacity is not infinite.   At some point, with all indicators being that Toronto will continue to grow, the Toronto North Station will likely see passengers once again.  If there are unforeseen freight service related obstacles preventing the Valley Line and Alto high-speed rail service being implemented as planned, that day may come sooner than expected.

The symbols used in the system and line maps and well as proposed signage will give users of the system an indication of what service frequency can be expected at a specific station on a specific line.  The service categories are "Urban", "Suburban", Regional", and "Limited".   

"Urban" service, denoted by a circular shape, indicates a very high frequency service of every 10 minutes or less except late at night.   Users of the system should feel comfortable showing up at these stations to catch a train, subway, or LRT at any time between 6 am and midnight without planning ahead.

"Suburban" service, using a square shape as a symbol, indicates an all-day service that runs at a frequency of every 30 minutes or less excluding late at night.   Travelers planning to use suburban services should understand the schedule before starting their journey to minimize their wait times but don't need to plan ahead.

"Regional" service, using a diamond shape (tilted square) symbol, represents an a service that runs many times throughout the day at a frequency of every 3 hours or less.   Travelers can count on this service getting them where they need to go, but should plan ahead because a large portion of their day could be wasted if they don't plan their day appropriately.

"Limited" service, symbolized with an inverted triangle, represents a service that runs only on certain days and/or that runs only at certain times of day.   This provides a more infrequent service to meet peak demands on routes that under most conditions are easily managed with busses but during peak periods need the extra capacity of a train.   Typically limited services meet the demand for things like morning and evening commutes, special events, and weekend/holiday rush.