Spot on Oskari, line speed is irrelevant. The safe max operating speed is always the first consideration.
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This is by a mile the most realistic of all the train sims. In regards, physics, sounds both dmu and rail sounds. Plus operation of the units themselves. I was a shed fitter on BR WR, mostly dmu's but also all the hydraulic classes from joining in the late 1960's. It doesn't get any better than this and i look forward to future development. Particularly in regards the editors, both route and scenario creation.