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Rail section for beginner

Hi all, I am new to 7.25" and about to begin building a brand new line which will be about 300m long. I have been researching rail. I have been offered some secondhand and rusty 25mm steel rail. However, I have seen online that I can buy 16mm rail cheaper. My line will be a narrow gauge line rather than standard gauge and with "sit in" coaches. I now dont know whether its best to go for the heavier section, or is 16mm ok on a lightly used private garden line?