Quote:
Originally Posted by Guideway
Why is lincoln field a 3 track station? Makes no sense to me...
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Normally, south-/west-bound (outbound) trains will use the west platform (the one closest to Lincoln Fields Shopping Center), with the train on the outside tracks. Normally, inbound trains will use the east-most platform, with the train on the outside tracks. So, under normal conditions, the central tracks are not used. The two branches will normally have successive trains alternating between the two such as:
1. outbound train to Bayshore at minute 0
2. outbound train to Baseline at minute 3
3. outbound train to Bayshore at minute 6
4. Outbound train to Baseline at minute 9
So a train on each branch at half the frequency of the line north of Lincoln Fields Station.
If it turns out that the Lincoln Fields Station has a lot of walk-on/walk-off passengers, or transferees to/from buses, then it might be useful to have a third train using the central tracks to provide additional capacity between Lincoln Fields and, say, Hurdman Stations. (Although Hurdman is not being designed for this, the Stage 2 study envisions this as an operation option.) This scenario would reduce the number of outbound trains that are split between the Bayshore and Baseline branches. That is, instead of having the 3-minute peak service being divided down to 6-minute service on each branch, there would be timing like this:
1. outbound train to Bayshore at minute 0
2. outbound train to Baseline at minute 3
3. outbound train short turned at minute 6
4. outbound train to Bayshore at minute 9
5. Outbound train to Baseline at minute 12
6. outbound train short turned at minute 15
Thus, the main-line north of Lincoln Fields will see a train every 3 minutes; each branch will get a train every 9 minutes. This might be an option during the shoulders of the peak periods.
At off-peak times, when there are trains north of Lincoln Fields every 15 minutes, the alternating trains on each branch would only run every half hour. This would make transit undesirable for many. An option suggested by the study team is to use the central track to handle a ‘shuttle’ train between Lincoln Fields and Bayshore Stations at the same (15-minute) frequency of the Baseline Branch. Using a shuttle means that both branches will have the same frequency of trains as the section north of Lincoln Fields.
The 15-minute trains would run the entire Confederation Line from Place D'Orléans to Baseline Stations and the shuttle would run a 15-minute service between Bayshore and Lincoln Fields Stations.. This operation requires the third set of tracks south of Lincoln Fields (connecting to the lines to/from Bayshore) so that the shuttle can run parallel to the inbound and outbound trains. The pattern would be:
1. the shuttle approaches from Bayshore on inbound tracks from Bayshore
2. inbound and outbound trains and shuttle all arrive at Lincoln Fields Station, with the shuttle in the middle
3. shuttle opens doors on both sides and passengers transfer to the appropriate train
4. both trains and the shuttle leave with the shuttle switching to the outbound tracks to Bayshore
Passengers from/to Baseline get the same 15-minute service that is north of Lincoln Fields and require no transfer. Passengers from/to Bayshore also get service every 15 minutes on their shuttle and have a quick transfer at Lincoln Fields to trains going in all directions.