diff --git a/docker/app.py b/docker/app.py
index e3f94b18..73f7b082 100644
--- a/docker/app.py
+++ b/docker/app.py
@@ -42,13 +42,16 @@ def is_invalid_status(status: str) -> bool:
 
 @app.post('/start')
 async def start_container(num_experiments: int, config: Request) -> JSONResponse:
-	container_info = manager.start(config=await config.json())
-	for _ in range(num_experiments):
-		container_info += manager.start(config=await config.json())
-	if (is_invalid_status(container_info.status) or container_info.data is False):
-		return JSONResponse(status_code=404, content=vars(container_info))
-	else:
-		return JSONResponse(vars(container_info))
+	final_infos = []
+	for number in range(num_experiments):
+		final_infos += [manager.start(config=await config.json())]
+		if (is_invalid_status(final_infos[number].status) or final_infos[number].data is False):
+			return JSONResponse(status_code=404, content=vars(final_infos[0]))
+	return_dict = {}
+	for index in range(num_experiments):
+		return_dict[index] = vars(final_infos[index])
+	print(f'successfully started {num_experiments} container')
+	return JSONResponse(return_dict)
 
 
 @app.get('/health/')
diff --git a/docker/docker_manager.py b/docker/docker_manager.py
index 83f956af..78c15996 100644
--- a/docker/docker_manager.py
+++ b/docker/docker_manager.py
@@ -32,21 +32,6 @@ def __init__(self, id: str, status: str, data=None, stream: GeneratorType = None
 		self.data = data
 		self.stream = stream
 
-	def __add__(self, other_docker_info):
-		resulting_docker_info = DockerInfo(id='not relevant', status='not relavant')
-		resulting_docker_info.id = self._add_to_list(self.id, other_docker_info.id)
-		resulting_docker_info.status = self._add_to_list(self.status, other_docker_info.status)
-		resulting_docker_info.data = self._add_to_list(self.data, other_docker_info.data)
-		resulting_docker_info.stream = self._add_to_list(self.stream, other_docker_info.stream)
-		return resulting_docker_info
-
-	def _add_to_list(self, var1, var2) -> list:
-		# var1 could be list
-		if type(var1) == list:
-			return var1 + [var2]
-		else:
-			return [var1, var2]
-
 
 class DockerManager():
 	"""
@@ -78,15 +63,16 @@ def __new__(cls):
 			cls._update_port_mapping()
 		return cls._instance
 
-	def start(self, config: dict) -> DockerInfo:
+	def start(self, config: dict, count: int) -> DockerInfo:
 		"""
 		To be called by the REST API. Create and start a new docker container from the image of the specified command.
 
 		Args:
 			config (dict): The combined hyperparameter_config and environment_config_command dictionaries that should be sent to the container.
+			count (int): number of containers that should be started
 
 		Returns:
-			DockerInfo: A JSON serializable object containing the id and the status of the new container.
+			DockerInfo: A JSON serializable object containing the id and the status of the new container(s).
 		"""
 		if 'hyperparameter' not in config:
 			return DockerInfo(id='No container was started', status='The config is missing the "hyperparameter"-field')
diff --git a/docker/test_docker_manager.py b/docker/test_docker_manager.py
index ee0ef372..a5b83be4 100644
--- a/docker/test_docker_manager.py
+++ b/docker/test_docker_manager.py
@@ -94,41 +94,3 @@ def test_port_mapping_initialization():
 def test_allowed_commands_is_up_to_date():
 	assert set(manager._allowed_commands) == {'training', 'exampleprinter', 'agent_monitoring'}, \
 		'The set of allowed commands has changed, please update this and all the other tests!'
-
-
-def test_docker_info_add():
-	docker_info1 = docker_manager.DockerInfo(id='test1', status='healthy', data='some test data', stream=None)
-	docker_info2 = docker_manager.DockerInfo(id='test2', status='not so healthy', data=False, stream=None)
-
-	expected_docker_info = docker_manager.DockerInfo(id='not relevant', status='not relavant')
-	expected_docker_info.id = ['test1', 'test2']
-	expected_docker_info.status = ['healthy', 'not so healthy']
-	expected_docker_info.data = ['some test data', False]
-	expected_docker_info.stream = [None, None]
-
-	resulting_docker_info = docker_info1 + docker_info2
-	assert expected_docker_info.id == resulting_docker_info.id
-	assert expected_docker_info.status == resulting_docker_info.status
-	assert expected_docker_info.data == resulting_docker_info.data
-	assert expected_docker_info.stream == resulting_docker_info.stream
-
-
-def test_docker_info_add_multiple():
-	docker_info1 = docker_manager.DockerInfo(id='test1', status='healthy', data='some test data', stream=None)
-	docker_info2 = docker_manager.DockerInfo(id='test2', status='not so healthy', data=False, stream=None)
-	docker_info3 = docker_manager.DockerInfo(id='test3', status='so lala', data=42, stream=None)
-
-	resulting_docker_info = docker_info1
-	for docker_info in [docker_info2, docker_info3]:
-		resulting_docker_info += docker_info
-
-	expected_docker_info = docker_manager.DockerInfo(id='not relevant', status='not relavant')
-	expected_docker_info.id = ['test1', 'test2', 'test3']
-	expected_docker_info.status = ['healthy', 'not so healthy', 'so lala']
-	expected_docker_info.data = ['some test data', False, 42]
-	expected_docker_info.stream = [None, None, None]
-
-	assert expected_docker_info.id == resulting_docker_info.id
-	assert expected_docker_info.status == resulting_docker_info.status
-	assert expected_docker_info.data == resulting_docker_info.data
-	assert expected_docker_info.stream == resulting_docker_info.stream