New York’s Metro-North and LIRR have 95%+ on-time rates [1]. (EDIT: On time is defined as less than 6 minutes late [2].)
[1] https://www.metro-magazine.com/10217862/metro-north-lirr-exp...
[2] https://www.osc.ny.gov/files/reports/pdf/report-9-2025.pdf