In 1893 , the General Railroad Standards were set for pocket watches . Any watch used from that point on had precise specifications that it must meet and every railroad employee had to carry a watch . Time was synchronized at every train stop with the telegraph clock .
When radio became available , the Canadian Broadcast Corporation signalled to the Nation the 1:00 pm hour . This allowed everyone across Canada to set watches and clocks including employees of the CPR . If you listen the the CBC today , at the end of the lunch hour , you ,too, can find out exactly what time it is in Canada ,wherever you are across all time zones .
An excellent article by Harold Clithroe -Railroad Time: Railroad Pocket Watches and the CPR- can be found through people.timezone.com . It is worth the read if only to see the precise specification for making a railroad watch and see pics of watches over more than 120 years .