With coasters where theming is placed close to the track, it is not possible to test just a coaster train at high speed.
There is a special process involved.
When that is completed, the real test rides come at high speed.
'𝐏𝐮𝐥𝐥-𝐓𝐡𝐫𝐨𝐮𝐠𝐡.'
A 'Pull-Through' is the process in which a coaster train is wholly or partly pulled through the track with a crane for checking.
In some cases just look at 'Taron' or also at 'VelociCoaster' they have made special 'coaches' (trays) with an iron template on top. The iron or wooden template you see on 'Millenium Force' and 'Hyperion' simulates the furthest reach a visitor could make while riding the coaster. And ensures that all clearances are met and that all surrounding theme elements and supports meet the requirements of the free space profile.
The process of a 'Pull-Through' is very slow. One or two large cranes slowly pull the 'Pull-Through' coach through the track. At 'VelociCoaster' the train moved approximately between 1.5 meters and 3 meters in an hour, which is literally stepped by step. That it goes so slowly, they can measure the distances between the supports and/or theme parts well.
In some cases where the crane cannot reach properly, the engineers secure the train to the track with tensioning straps. Then they use a 'hand ratchet winch' to get the 'Pull-Through' coach through the track by hand.
𝐃𝐢𝐝 𝐲𝐨𝐮 𝐤𝐧𝐨𝐰 𝐭𝐡𝐚𝐭....When they found out during the 'Pull-Through' test run of 'Raik' in Phantasialand that some rocks came too close to the free-space profile, they removed a piece of rock and had to be moved.
𝐀𝐧𝐝 𝐭𝐡𝐚𝐭 𝐭𝐨𝐨 ...The (renewed) 'Python' in the Efteling in March 2018 also had a 'Pull-Through?'
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