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o/s is the telegraph code meaning, probably, <br />"on sheet". The telegraph operator would wire the <br />dispatcher with the times of a trains arrival and departure. The opr would wire OS and the telegraphic code for the station. For example <br />on the SP Z was Martinez. K was Davis and Q Oakland. OPR: OS Martinez DISPR: OS Martinez <br />OPR: OS No 14 eng 4449 none (or no signals) 928 pm and 934pm. delay:passengers and baggage.
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