Cars are (relatively) light and have huge grippy rubber tyres rubbing on a grippy road surface.
Trains are heavy. Even a ‘light’ passenger train can clock in at 40 tons per coach, freight trains can weigh thousands of tons. They have metal wheels making tiny amounts of contact on a metal track. The upside of this is once they get going it’s very easy and efficient to keep them at that speed, the downside is that it takes a mile to stop.
TLDR: inertia.
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