$ java -jar gtfs-rt-printer-1.0.0.jar http://localhost:8001/tripUpdates
 
 loading http://localhost:8001/tripUpdates
 feed contains 459 messages
 trip {
   trip_id: "A20171105WKD_090150_4..S06R"
   start_date: "20180426"
   route_id: "4"
   [transit_realtime.nyct_trip_descriptor] {
     train_id: "04 1507+ WDL/UTI"
     is_assigned: true
     direction: SOUTH
   }
 }
 stop_time_update {
   arrival {
     time: 1524770508
   }
   departure {
     time: 1524770508
   }
   stop_id: "413S"
   [transit_realtime.nyct_stop_time_update] {
     scheduled_track: "1"
   }
 }
 ...

$ java -jar gtfs-rt-printer-1.1.0.jar ../src/test/resources/bart.pb| head
  loading ../src/test/resources/bart.pb
  feed contains 42 entities
  trip {
    trip_id: "1010958SAT"
  }
  stop_time_update {
    stop_sequence: 17
    departure {
      delay: 120
      uncertainty: 30

$ java -jar gtfs-rt-printer-1.0.0.jar -header 'Accept: application/x-google-protobuf' -header 'Authorization: apikey ' https://api.transport.nsw.gov.au/v1/gtfs/realtime/sydneytrains | head
loading https://api.transport.nsw.gov.au/v1/gtfs/realtime/sydneytrains
Setting header Accept:  application/x-google-protobuf
Setting header Authorization:  apikey 
feed contains 299 entities
trip {
  trip_id: "85-Z.1283.125.128.A.8.51118258"
  schedule_relationship: SCHEDULED
  route_id: "CMB_2c"
}
timestamp: 1525537117

$ java -jar gtfs-rt-printer-1.1.0.jar -user username -password password http://www.rtd-denver.com/google_sync/TripUpdate.pb
$ java -jar gtfs-rt-printer-1.2.0.jar -user accessKey -password secretKey https://gtfsapi.metrarail.com/gtfs/raw/tripUpdates.dat