There a great info in here about frequency vs. cost that would also hold true for things like rail service to Sarnia. https://www.railwayage.com/news/second-in-a-series-cutting-service-actually-costs-more/

When train frequency is reduced fixed costs like stations generally are not. One example is Atlantic VIA rail service going from 6 days per week to 3. Even though frequency was cut in 1/2 costs only went down 10% on the route.

Revenue though decreased 25% and net operating losses were only minimally reduced in year 1 and actually grew in year 2.

The net result was poorer service, little change in overall government subsidy dollars and and dramatic increase in subsidy per passenger km travelled of 60%.

When it comes to affordable and reliable publicly supported passenger rail service frequency is paramount to success.