diff --git a/include/config_parser.hpp b/include/config_parser.hpp
index 86f63bb..48f14e5 100644
--- a/include/config_parser.hpp
+++ b/include/config_parser.hpp
@@ -3,6 +3,7 @@
 #include <fmt/ostream.h>
 #include <fmt/ranges.h>
 #include <cstddef>
+#include <cstdint>
 #include <optional>
 #include <random>
 #include <string_view>
@@ -102,7 +103,7 @@ struct SimulationOptions
         = std::variant<DeGrootSettings, ActivityDrivenSettings, ActivityDrivenInertialSettings, DeffuantSettings>;
     Model model;
     std::string model_string;
-    int rng_seed = std::random_device()();
+    int64_t rng_seed = std::random_device()();
     OutputSettings output_settings;
     ModelVariantT model_settings;
     InitialNetworkSettings network_settings;
diff --git a/include/network.hpp b/include/network.hpp
index 8056b62..4f268ce 100644
--- a/include/network.hpp
+++ b/include/network.hpp
@@ -58,6 +58,16 @@ class Network
     {
     }
 
+    Network(
+        const std::vector<std::vector<size_t>> & neighbour_list, const std::vector<std::vector<WeightT>> & weight_list,
+        EdgeDirection direction )
+            : agents( std::vector<AgentT>( neighbour_list.size() ) ),
+              neighbour_list( neighbour_list ),
+              weight_list( weight_list ),
+              _direction( direction )
+    {
+    }
+
     Network(
         std::vector<std::vector<size_t>> && neighbour_list, std::vector<std::vector<WeightT>> && weight_list,
         EdgeDirection direction )
diff --git a/src/config_parser.cpp b/src/config_parser.cpp
index 57e384f..a674cc5 100644
--- a/src/config_parser.cpp
+++ b/src/config_parser.cpp
@@ -113,7 +113,7 @@ SimulationOptions parse_config_file( std::string_view config_file_path )
     toml::table tbl;
     tbl = toml::parse_file( config_file_path );
 
-    options.rng_seed = tbl["simulation"]["rng_seed"].value_or( int( options.rng_seed ) );
+    options.rng_seed = tbl["simulation"]["rng_seed"].value_or( int64_t( options.rng_seed ) );
 
     // Parse output settings
     options.output_settings.n_output_network = tbl["io"]["n_output_network"].value<size_t>();
diff --git a/test/test_io.cpp b/test/test_io.cpp
index f49ab58..1934047 100644
--- a/test/test_io.cpp
+++ b/test/test_io.cpp
@@ -3,6 +3,7 @@
 #include "models/ActivityDrivenModel.hpp"
 #include "network.hpp"
 #include "network_generation.hpp"
+#include "network_io.hpp"
 
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/matchers/catch_matchers_floating_point.hpp>
@@ -38,6 +39,38 @@ TEST_CASE( "Test reading in the network from a file", "[io_network]" )
     }
 }
 
+TEST_CASE( "Test writing the network to a file", "[io_network]" )
+{
+    using namespace Seldon;
+    using namespace Catch::Matchers;
+    using AgentT  = ActivityDrivenModel::AgentT;
+    using Network = Network<AgentT>;
+
+    std::vector<std::vector<size_t>> neighbours        = { { 3, 1 }, {}, { 1 } };
+    std::vector<std::vector<Network::WeightT>> weights = { { -0.1, -0.5 }, {}, { -0.2 } };
+
+    // Construct a network
+    auto network = Network( neighbours, weights, Network::EdgeDirection::Incoming );
+
+    // Save the network to a file
+    auto proj_root_path = fs::current_path();
+    auto network_file   = proj_root_path / fs::path( "test/network_out.txt" );
+    network_to_file( network, network_file );
+
+    // Read the network back in
+    auto network_from_file = Seldon::NetworkGeneration::generate_from_file<AgentT>( network_file );
+
+    for( size_t i = 0; i < network.n_agents(); i++ )
+    {
+        fmt::print( "{}", i );
+        REQUIRE_THAT(
+            network.get_neighbours( i ),
+            Catch::Matchers::UnorderedRangeEquals( network_from_file.get_neighbours( i ) ) );
+        REQUIRE_THAT(
+            network.get_weights( i ), Catch::Matchers::UnorderedRangeEquals( network_from_file.get_weights( i ) ) );
+    }
+}
+
 TEST_CASE( "Test reading in the agents from a file", "[io_agents]" )
 {
     using namespace Seldon;