Basically the change on Lakeshore West in the AM Peak is that they added two new local round trips from Oakville to Union in the early morning (in addition to 3 pre-existing), and made everything else express. There is now a regular service pattern throughout the AM Peak with express trains every 15 minutes (2tph from Hamilton Centre, 1tph from West Harbour and 1tph starting from Aldershot), and local trains every 30 minutes from Oakville to Union.
Here is the breakdown by arrival time at Union:
7:00 - 7:59 Current: 2 local, 2 express | New: 2 local, 4 express
8:00 - 8:59 Current: 4 local, 2 express | New: 2 local, 4 express
9:00 - 9:59 Current: 3 local, 1 express | New: 3 local, 1 express
I suspect that making the West Harbour trips run express instead of local will make West Harbour a more popular station. Trains now cover Hamilton West Harbour to Toronto Union in 67 minutes, which is very respectable.
Also the Niagara-West Harbour portion is now 9 minutes slower, bringing the total Niagara-Toronto weekday trip up to 2h32. Anyone know what's up with that portion of the line? I know they're doing work on the Welland bridge but that shouldn't slow things down this much.
Notable as well that it brings peak hour express service to West Harbour up to 3 trips from the previous 1 (which continued on to Niagara).
Lakeshore West service also notably now matches pre-covid schedules, which also had 9 peak period express trips. Now if they could just match the off-peak service levels and bring back 20-minute service to Oakville!
Pre-pandemic off-peak service to Oakville was 3 tph (headways 15, 15, 30) but in September 2021 we had full 15 minute local service from Oakville to Oshawa, plus half-hourly express service in the peaks.