1package main23// The URL to hit for the statuses of all trains returning only the4// information we care about.5const apiEndpoint = "https://api-v3.mbta.com/vehicles?filter[route]=Red,Orange,Green-B,Green-C,Green-D,Green-E&include=stop&fields[vehicle]=label,current_status,direction_id"67// The lines the car could be on.8const (9 LineUnknown = iota10 Red = iota11 Orange = iota12 GreenB = iota13 GreenC = iota14 GreenD = iota15 GreenE = iota16)1718// The directions a train could be headed in.19const (20 DirectionUnknown = iota21 North = iota22 South = iota23 East = iota24 West = iota25)