You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Near_East

Context:
The threat that caused Gordon, diplomat and military officer, to publish the article was resumption of work on a railway from Russia to the Persian Gulf. Gordon, a published author, had not used the term previously, but he was to use it from then on.

Question:
What threat caused Gordon to publish his article?

resumption of work on a railway