Mostyn was the original name of the rail siding that is now known as Lestock.
Mostyn was assigned its name as part of the Grand Trunk Pacific Railroad between 1900 and 1910. Back when the Grand Trunk Railway Company was planning a western expansion of their establish rail system, an unknown person devised an alphabetical naming scheme to name all of the un-named stations and sidings, starting in Manitoba, cycling five full rounds of the alphabet, and starting a sixth before finally ending at Prince Rupert, British Columbia. Mostyn was part of the second round, between Leross and Touchwood. Touchwood apparently took the place of whatever was planned for the letters 'N' and 'O' before Punnichy.
Mostyn was the name chosen by Grand Trunk Railroad staff. When the railroad was built and a siding was set up, a hamlet sprang up almost immediately and Mostyn post office was established. The site of the siding and settlement had been surveyed by John Lestock Reid, who had become very popular amongst the locals while surveying. When the first council of the community was required to choose a name, they decided to use the surveyor's middle name instead of Mostyn. As such, the post office, hamlet, and siding took the name "Lestock" instead of "Mostyn".
Grand Trunk Pacific Railroad went out of business in the early 1920's. The railroad was taken over by the Canadian government and was made part of the Canadian National Railroad which is very active to this day, and "Mostyn" is pretty much forgotten.
Here are links to excellent online resources regarding the history of Lestock:
Historic aerial photo of Lestock in the 1950's
Memories of Lestock
website of the Village of Lestock
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