A suspicious package found in front of Chancellor Helmut Kohl's office early Thursday turned out to contain a brake cylinder and not a bomb, police said.
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The engine's vacuum brake cylinders were fitted outside the main frames under the running boards on each side, between the second and third pairs of coupled wheels.
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How this works is there is a brake cylinder that connects master cylinder to the drum brake via brake lines that transfer pressure from the master cylinder.
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These valves responded to a rise in train pipe pressure as the brake was applied, and admitted atmospheric air directly to the underside of the brake cylinder.
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They were connected such that the main cylinder and the speed / braking cylinders had to be set to zero to disconnect the motors or change direction.
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Traffic in the area was rerouted as the explosives specialists examined the package, and they found a brake cylinder inside, said a spokesman for the Federal Border Police.
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It operates at 10 bar and in addition to feeding each brake cylinder reservoir also provides air for the secondary suspension systems ( air bags ) and power doors.
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Under braking conditions a blowdown valve releases air from the brake cylinder of any axle if the rotational speed varies significantly from the average axle speed on the train.
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The piston in the brake cylinder has a flexible piston ring that allows air to pass from the upper part of the cylinder to the lower part if necessary.
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What he wasn't expecting was having to make an emergency trip to an auto-parts store to buy a brake cylinder and then having to install it between qualifying sessions.
