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@ -643,9 +643,8 @@ void StartupOneEngine(Engine *e, Date aging_date)
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e->company_avail = 0;
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e->company_hidden = 0;
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/* Don't randomise the start-date in the first two years after gamestart to ensure availability
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* of engines in early starting games.
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* Note: TTDP uses fixed 1922 */
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/* Vehicles with the same base_intro date shall be introduced at the same time.
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* Make sure they use the same randomisation of the date. */
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SavedRandomSeeds saved_seeds;
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SaveRandomSeeds(&saved_seeds);
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SetRandomSeed(_settings_game.game_creation.generation_seed ^
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@ -654,6 +653,9 @@ void StartupOneEngine(Engine *e, Date aging_date)
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e->GetGRFID());
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uint32 r = Random();
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/* Don't randomise the start-date in the first two years after gamestart to ensure availability
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* of engines in early starting games.
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* Note: TTDP uses fixed 1922 */
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e->intro_date = ei->base_intro <= ConvertYMDToDate(_settings_game.game_creation.starting_year + 2, 0, 1) ? ei->base_intro : (Date)GB(r, 0, 9) + ei->base_intro;
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if (e->intro_date <= _date) {
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e->age = (aging_date - e->intro_date) >> 5;
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