There were definitely trams with higher fleet numbers than the 229 quoted above - re-running the film sees what appears to be 357 and there is reference at 0:52:46 to car 349 'running away' in June 1929, however that scotches (!) your theory about carrying on the sequence (though the preponderance of double digit numbers in the film suggests that there may well have been gaps in the numbering system - maybe based on depots?).
Quote:
The accident took place on 1 June 1929. Car 349 was at Liberton terminus parked only on the air brake and without its crew.
The air leaked off and the car drifted away, gained speed, crashing at the first curve. There were several elderly passengers, all unhurt!
Information from Edinburgh’s Transport - The Corporation Years by DLG Hunter.
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From:-
http://www.ferrymeadtramway.org.nz/d...february08.pdf
A photograph of the car 349 crash can be found on page 4 of:-
http://www.ferrymeadtramway.org.nz/d...december07.pdf