From 739df52fa75de187d62810c66ffc235cf4c921f9 Mon Sep 17 00:00:00 2001
From: Giacomo Spigler <spiglerg@gmail.com>
Date: Tue, 11 Jun 2019 10:56:46 +0200
Subject: [PATCH] fixed issue #60

---
 flatland/envs/rail_env.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/flatland/envs/rail_env.py b/flatland/envs/rail_env.py
index c3ed6e02..6cd64514 100644
--- a/flatland/envs/rail_env.py
+++ b/flatland/envs/rail_env.py
@@ -173,7 +173,9 @@ class RailEnv(Environment):
         # Return the new observation vectors for each agent
         return self._get_observations()
 
-    def step(self, action_dict):
+    def step(self, action_dict_):
+        action_dict = action_dict_.copy()
+
         alpha = 1.0
         beta = 1.0
 
-- 
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