From another thread ..
The problem is greater than I thought. However, can think of a few ways to meet the demand, short of stopping the LRT service for several years in order to build a new tunnel.
1. The report mentions that "the current plan for 2-car trainsets on 5-min headways may not be sufficient", and "it may be necessary to plan for 3-min headways and/or 3-car trainsets".
Which means, 3-car trainsets might be sufficient to handle the demand, without changing the headways.
All underground ECLRT stations are built to be easily convertible for 3-car trains. For the surface section, there may be some challenges, particularly fitting the platforms for 3-car trains. But if there is a pressing need, then it should be doable, for a small cost and relatively quickly.
2. The 4 major N-S bus routes through the area are shown to be near or above capacity north of Eglinton, but below 85% south of Eglinton. Looks like an opportunity to run more buses during the peak, between Eglinton and the closest Line 2 station, to divert some of the demand there.
3. The Eglinton bus. Could run a short-turn peak-period branch #34 between the Science Centre and Kennedy, stopping more frequently than the LRT, and thus diverting some of the riders. Obviously, the bus capacity is a fraction of LRT's. But if the LRT on its own is only 10% above capacity, not 50% above, then the bus can help bring the demand just below the limit.