Today's historic photo of the day: Rail flaw detection vehicle SRS141 passes through Hawkesbury River, NSW, September 5 1983.

SRS141 was built in 1928 in St Louis (USA) as a passenger #railcar for the Chicago, Rock Island & Pacific Railroad. In 1972, it was converted by Sperry to provide rail flaw detection services to US railroads.

In 1973 it came to Australia, and roamed the NSW checking for rail flaws. It eventually returned to North America certainly by 2002, and is still in use over there

Hawkesbury River station is unusual in that its name is different from the town it serves. At 57km north of Sydney on the electrified main north line to Gosford and Newcastle, it's obviously on the Hawkesbury River, but despite its name, it serves the little town of Brooklyn. It's also the point of connection for ferries to Dangar Island and also the 'Riverboat Postman' tourist cruise.
@railmaps If it was a St Louis Car Co. "Doodlebug" then it shares heritage with the Victorian Railways DERM fleet - the first DERM (then a PERM) was 55RM built April 1928 at St Louis Car Co and shipped to Melbourne in kit form for reassembly