Create a rapid transit query — tm_rt

Constructs a TmRTQuery object for the given MBTA rapid transit line. Chain builder methods to set context, then call a terminal method to fetch data.

Usage

tm_rt_query(line, base_url = tm_base_url())

Arguments

line: Line name: "Red", "Orange", "Blue", "Green", or "Mattapan". Case-insensitive; "line-red" form also accepted.
base_url: API base URL. Defaults to the production host or the tm_dashboard_base_url option.

Value

A TmRTQuery R6 object.

Examples

if (FALSE) { # \dontrun{
# Headways at Harvard on the Red Line
tm_rt_query("Red")$stop("Harvard")$headways("2024-01-15")

# Travel times (direction required for stop ID resolution)
tm_rt_query("Red")$from_stop("Alewife")$to_stop("Kendall/MIT")$direction("southbound")$travel_times("2024-01-15")

# Line-level aggregate (no stop needed)
tm_rt_query("Red")$date_range("2024-01-01", "2024-01-31")$trip_metrics("daily")
} # }