thumb|right|A wheeltapper at work on the Bulgarian railway in 2009. thumb|A wheeltapper's hammer with the rings. thumb|right|A wheeltapper signing off after checking the wheels of a train at Budapest-Keleti railway station in 2014. He has placed his long hammer on the train's buffers. A wheeltapper is a railway worker employed to check the structural integrity of train wheels and that axle boxes are not overheating.
thumb|right|A wheeltapper at work on the Bulgarian railway in 2009. thumb|A wheeltapper's hammer with the rings. thumb|right|A wheeltapper signing off after checking the wheels of a train at Budapest-Keleti railway station in 2014. He has placed his long hammer on the train's buffers. A wheeltapper is a railway worker employed to check the structural integrity of train wheels and that axle boxes are not overheating.
Typically employed at large urban railway stations and in goods yards, they tap wheels with a long-handled hammer and listen to the sound made to determine the integrity of the wheel; cracked wheels, like cracked bells, do not sound the same as their intact counterparts (they do not "ring true").
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).