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A man trying to stop a train during an emergency
ARP23A18_324

A man trying to stop a train during an emergency

The instrument panel for pneumatic signalling system, Pittsburgh Yards, Pennsylvania Railroad
ARP23A18_336

The instrument panel for pneumatic signalling syst...

Scenes at Pittsburgh during the railway workers strike
ARP23A18_312

Scenes at Pittsburgh during the railway workers st...

A Model of King's automatic block system of railway signalling
ARP23A18_321

A Model of King's automatic block system of railwa...

Primrose Hill Tunnel, on the London and Birmingham Railway line
ARP23A18_337

Primrose Hill Tunnel, on the London and Birmingham...