I don't think there was a way to pause the game while building. But usually at the start of the game you'll quickly run out of money when building new tracks, buying new ships, etc.
I've never felt the game went too fast, except maybe towards the end when a lot of vehicles (in its broadest sense) need replacing.
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A sickened, sensitive shadow writhing in hands that are not hands, and whirled blindly past ghastly midnights of rotting creation (Nyarlathotep, H.P. Lovecraft)
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