diff --git a/src/core/smallvec_type.hpp b/src/core/smallvec_type.hpp
deleted file mode 100644
--- a/src/core/smallvec_type.hpp
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is part of OpenTTD.
- * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
- * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @file smallvec_type.hpp Simple vector class that allows allocating an item without the need to copy this->data needlessly. */
-
-#ifndef SMALLVEC_TYPE_HPP
-#define SMALLVEC_TYPE_HPP
-
-#include "mem_func.hpp"
-
-/**
- * Helper function to append an item to a vector if it is not already contained
- * Consider using std::set, std::unordered_set or std::flat_set in new code
- *
- * @param vec A reference to the vector to be extended
- * @param item Reference to the item to be copy-constructed if not found
- *
- * @return Whether the item was already present
- */
-template <typename T>
-inline bool include(std::vector<T>& vec, const T &item)
-{
-	const bool is_member = std::find(vec.begin(), vec.end(), item) != vec.end();
-	if (!is_member) vec.emplace_back(item);
-	return is_member;
-}
-
-/**
- * Helper function to get the index of an item
- * Consider using std::set, std::unordered_set or std::flat_set in new code
- *
- * @param vec A reference to the vector to be extended
- * @param item Reference to the item to be search for
- *
- * @return Index of element if found, otherwise -1
- */
-template <typename T>
-int find_index(std::vector<T> const& vec, T const& item)
-{
-	auto const it = std::find(vec.begin(), vec.end(), item);
-	if (it != vec.end()) return it - vec.begin();
-
-	return -1;
-}
-
-#endif /* SMALLVEC_TYPE_HPP */