add_route_timestamps: keep real-time data where possible

							if ( $station->[2]{isCancelled} ) {

								$sd->{isCancelled} = 1;

							}

							# keep rt_dep / rt_arr if they are no longer present

							my %old;

							for my $k (qw(rt_arr rt_dep arr_delay dep_delay)) {

								$old{$k} = $station->[2]{$k};

							}

							$station->[2] = $sd;

							for my $k (qw(rt_arr rt_dep arr_delay dep_delay)) {

								$station->[2]{$k} ||= $old{$k};

							}

						}

					}