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Film Friday: 'Head On' pits a 1938 Chevy against a mighty locomotive

The train is, in many ways, the enemy of the automobile. We're not even getting philosophical about personal transportation versus mass transit or diving into disputes over whether to fund interstates or railways: Trains are simply bigger and heavier than even the bulkiest of cars, and they're quite happy to turn any vehicle that happens to be parked on their tracks into scrap-metal pancakes without slowing down. It's physics, people.

New commenting rules on CAR Online

CAR Online has a reputation for intelligent, friendly and informed debate – both in our forum and on the comments attached to each story. However, a minority of users has recently dragged the standard of conversation down, ruining the enjoyment of the majority. Today we launch new guidelines so our users know the ground rules; we hope to moderate more effectively and introduce a new three-strikes-and-you're-out-rule.'We have to act to protect CAR Online's quality debate,' said associate editor Tim Pollard.

Concept Car of the Week: Plymouth XNR (1960)

In the early ‘50s, both GM and Ford offered attractive and exciting sports cars, symbols of a proud post-war America. Ford had the Thunderbird and GM the Corvette, but Chrysler's approach was more pragmatic, producing cars that were practical and robust but also slow. After commissioning a long series of concepts designed by Italian carrozzeria Ghia, Chrysler gave a free hand to its design chief Virgil Exner to inject some life into its lineup.