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Just another modeller
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Length is not a problem - 2m is a relatively short train if the track is appropriate - BUT - 90cm x 90cm is quite small - that makes the gauge 16.5mm max, 9mm possible. It also only gives you a maximum appx 3 metres to the full circle so the end of the train will be pretty close to the front!

Hope for the larger gauge, as if its in 16.5/OO scale or similar then reliable tracking and smoothness of movement will potentially be of a much higher quality that 9mm/N scale.

I suspect that pushing the train with a motion controlled dolly will be exceptionally difficult to get smooth - Pushing is a worst case for smooth motion as the mass of the train will be extremely small and there's likely to be a lot of forward/rearward jerkyness compared to using a high quality locomotive digitally (DCC) controlled, which would allow it to move along under its own steam in a smooth and very controllable fashion to synchronise with the movement speed of the camera.

(DCC control allows adjustment of overall loco speed range limits which allied to 128 possible speed steps would therefore allow matching to dolly speed very easily - anything from about 100mm / minute upward can be done no problem)

This will also remove a major variable in that if pushed, as Neil said, variances in tracklaying quality may compromise quality and it sound like thats a variable U have little control over.

Doing it that way will also remove (a) the need for absolute precision in the arc of motion of the camera vs train and (
it will lessen the direct interdependency of camera and train, which must be a bugger to get right with a tight shot and close to macro type settings - it will also end up leaving U much more flexibility in focal length & general filming.


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