You have to remember that the Cape is only remotely busy 3 months out of the year and the density is low as it is. Most stores close or have limited hours past Labor Day.
Traffic even in the summer isn't that bad other than getting on/off the Cape at times. Which (yes) a wider Sagamore would help. You do need a car though.
Regardless of the "need a car" when you get there argument, intercity train travel is still quite valuable for park and ride or kiss and ride. There are many instances of people I know who have driven two seperate SOV to the Cape due to different schedules and one of them would have taken the train and met one another on the Cape if they knew the service existed or if the service was better. Intercity train travel can be useful even if its terminus in an arguably auto-centric location.
Fast, frequent, consistent, and regular service between Hyannis and South Station is an important step in priming ridership for these types of trips.
The first two steps to doing so is to make service more consistent and to improve the speed of the trip, which is abysmal past Middleborough/Lakeville. With no changes between South Station and Middleborough/Lakeville, just while upgrading the Middleborough/Lakeville to Hyannis stretch alone, we would have:
Average Speed Middleborough/Lakeville -> Hyannis (including stops) | Travel Time (Middleborough/Lakeville -> Hyannis) | Travel Time (South Station -> Hyannis) |
---|
Current: 26.1 mph | 1:40 | 2:38 |
30 mph | 1:27 | 2:25 |
40 mph | 1:05 | 2:03 |
50 mph | 0:52 | 1:50 |
60 mph | 0:44 | 1:42 |
Currently, it's already competitive with driving from South Station at the PM peak three days per week in the summer, without factoring in time to/from station. Even without track upgrades, getting a more robust summer schedule with one round trip per weekday (outbound AM and inbound PM) and two round-trips per weekend day (one AM and one PM) would do wonders to build ridership. You could still halt service in the off-season to facilitate track work.
Then, at a 30 mph average over that stretch of track, it's competitive with driving from South Station to Hyannis for Tuesday - Friday afternoon departures and Saturday midday departures. It's even competitive from Middleborough/Lakeville as a park'n'ride on summer Fridays and Saturdays.
At a 40 mph average over that stretch, it's competitive with driving from South Station to Hyannis every weekday afternoon departing between 1:30 and 4:30, and as late as 6:00 some days, as well as Saturday midday. It's now very viable as a park/n/ride from Middleborough/Lakeville. To the point where I could see demand exploding if frequency were increased. That is a good reassess point and consider yearround service, but we should be aiming to get there: daily service in the summer (two round trips on weekends), with a 40mph average speed between Middleborough/Lakeville and Hyannis.