New South Walesi raudteevalitsus ehitas 1903. aastal seadme, mis nimetati rotameetriks ja mis koosnes neljarattalisest vankrist, millel oli lisaks suur viies ratas, mis veeres mööda rööpa pealispinda. Viimati kasutati seda raudteepikkusmõõturit teadaolevalt 1920. aastatel.
The New South Wales Government Railways constructed in 1903 a device, that authority named the machine a rotameter, consisted of a four-wheel trolley with an additional large fifth wheel which traveled along the running surface of the rail. Its last recorded use was in the 1920s.
