GTR may refer to:
==Transportation== Great River Railroad, in Mississippi, US Grand Trunk Railway, a defunct North American railway Golden Triangle Regional Airport (IATA and FAA LID codes), serving Columbus, Mississippi, US Govia Thameslink Railway, a British railway operator GTR Euroseries, a short-lived European auto racing series Global Technical Regulations, a 1998 multinational agreement regarding vehicle regulations
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).