List all available commuter rail routes
Value
A sorted character vector of CR route IDs.
Examples
tm_cr_routes()
#> [1] "CR-Fairmount" "CR-Fitchburg" "CR-Franklin" "CR-Greenbush"
#> [5] "CR-Haverhill" "CR-Kingston" "CR-Lowell" "CR-Middleborough"
#> [9] "CR-Needham" "CR-NewBedford" "CR-Newburyport" "CR-Providence"
#> [13] "CR-Worcester"