diff --git a/apps/transport/lib/registry/engine.ex b/apps/transport/lib/registry/engine.ex
index 17198d3e9c..0ebbeec0fb 100644
--- a/apps/transport/lib/registry/engine.ex
+++ b/apps/transport/lib/registry/engine.ex
@@ -19,13 +19,13 @@ defmodule Transport.Registry.Engine do
     create_empty_csv_with_headers(output_file)
 
     enumerate_gtfs_resources(limit, formats)
-    |> Extractor.traverse(&prepare_extractor/1)
+    |> Extractor.map_result(&prepare_extractor/1)
     |> Task.async_stream(&download/1, max_concurrency: 10, timeout: 120_000)
     # one for Task.async_stream
-    |> Extractor.keep_results()
+    |> Extractor.cat_results()
     # one for download/1
-    |> Extractor.keep_results()
-    |> Extractor.traverse(&extract_from_archive/1)
+    |> Extractor.cat_results()
+    |> Extractor.map_result(&extract_from_archive/1)
     |> dump_to_csv(output_file)
   end
 
diff --git a/apps/transport/lib/registry/extractor.ex b/apps/transport/lib/registry/extractor.ex
index 34ebb9e14d..19ab45308b 100644
--- a/apps/transport/lib/registry/extractor.ex
+++ b/apps/transport/lib/registry/extractor.ex
@@ -11,16 +11,16 @@ defmodule Transport.Registry.Extractor do
 
   @callback extract_from_archive(path :: Path.t()) :: result([Stop.t()])
 
-  @spec keep_results(Stream.t(result(term()))) :: Stream.t(term())
-  def keep_results(enumerable), do: Stream.flat_map(enumerable, &keep_result/1)
+  @spec cat_results(Stream.t(result(term()))) :: Stream.t(term())
+  def cat_results(enumerable), do: Stream.flat_map(enumerable, &keep_ok/1)
 
-  defp keep_result({:ok, result}), do: [result]
-  defp keep_result(_), do: []
+  defp keep_ok({:ok, result}), do: [result]
+  defp keep_ok(_), do: []
 
-  @spec traverse(Stream.t(term()), (term() -> result(term()))) :: Stream.t(term())
-  def traverse(enumerable, mapper) do
+  @spec map_result(Stream.t(term()), (term() -> result(term()))) :: Stream.t(term())
+  def map_result(enumerable, mapper) do
     enumerable
     |> Stream.map(mapper)
-    |> keep_results()
+    |> cat_results()
   end
 end
diff --git a/apps/transport/test/registry/extractor_test.exs b/apps/transport/test/registry/extractor_test.exs
index 462196cea3..da60497735 100644
--- a/apps/transport/test/registry/extractor_test.exs
+++ b/apps/transport/test/registry/extractor_test.exs
@@ -4,23 +4,23 @@ defmodule Transport.Registry.ExtractorTest do
   require Integer
   alias Transport.Registry.Extractor
 
-  test "keep_results" do
-    assert [] == keep_results([])
-    assert [] == keep_results([{:error, "Error message"}])
-    assert [1, 3] == keep_results([{:ok, 1}, {:error, "Error message"}, {:ok, 3}])
+  test "cat_results" do
+    assert [] == cat_results([])
+    assert [] == cat_results([{:error, "Error message"}])
+    assert [1, 3] == cat_results([{:ok, 1}, {:error, "Error message"}, {:ok, 3}])
   end
 
-  test "traverse" do
-    assert [] == traverse([], &even_is_forbidden/1)
-    assert [1, 3, 5, 7, 9] == traverse(1..10, &even_is_forbidden/1)
+  test "map_result" do
+    assert [] == map_result([], &even_is_forbidden/1)
+    assert [1, 3, 5, 7, 9] == map_result(1..10, &even_is_forbidden/1)
   end
 
-  defp keep_results(enumerable) do
-    enumerable |> Extractor.keep_results() |> Enum.to_list()
+  defp cat_results(enumerable) do
+    enumerable |> Extractor.cat_results() |> Enum.to_list()
   end
 
-  defp traverse(enumerable, mapper) do
-    enumerable |> Extractor.traverse(mapper) |> Enum.to_list()
+  defp map_result(enumerable, mapper) do
+    enumerable |> Extractor.map_result(mapper) |> Enum.to_list()
   end
 
   defp even_is_forbidden(i) when Integer.is_odd(i), do: {:ok, i}