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This article is written in British English, which has its own spelling conventions (colour, travelled, centre, realise, defence), and some terms used in it are different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus.
As there is an article on Transilien and an article on Gare Saint-Lazare, wouldn't it be accurate to not have an article on something that doesn't exist ? I will place a redirect on this article linking it to Gare Saint-Lazare as what seems to be called Transilien Paris – Saint-Lazare is the Réseau Saint-Lazare.
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