M550-M555
This series of six differential dump cars was built in 1922 and 1923.
Differential Dump M-551 shows off its Port Authority sticker at the Sand Loading ramp in the Back Yard -- 1971. This car was restored by PAT in 1979.
From the collection of Bob Schmidt.
Other Pictures of this series:
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M551 sits with a load of (useful?) ties at the Castle Shannon Yard in 1948.
Picture by Bill Vigrass.
M555 picked up a passenger or two in the lower yard at tunnel.
Picture by Clarence Gerst from the Bob Rathke collection.
In 1957 M552 sat with nothing to do in the lower yard next to Beltzoover Ave.
Picture by Clarence Gerst from the Bob Rathke collection.
