As a recipient of federal funding, Caltrain is required to report ridership data to the National Transit Database (NTD). In accordance with NTD program guidelines, this reported ridership is generated using a methodology based on randomly sampled ride checks. While this sampling method is statistically valid at the annual level, the limited sample size means Caltrain’s NTD ridership figures are not statistically reliable at the monthly level. For Caltrain’s monthly ridership, please refer to the fare media-sales based estimates on the main ridership page.
The NTD profile for the Peninsula Corridor Joint Power Board (PCJPB), the governing body for the Caltrain, can be found on the NTD webpage.