Something that always played on my mind is how to the buffers retract when not needed and they can be be pulled out when standard coupling is used. Is it the case of a hydraulic piston is drained/ tapped off somewhere so the buffer can be pushed back when not needed and then the hydraulic piston is re pressurised when in normal use.
Is it the same for rolling stock Mk2/3s and for the push pull 201s.
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Railer
Something that always played on my mind is how to the buffers retract when not needed and they can be be pulled out when standard coupling is used. Is it the case of a hydraulic piston is drained/ tapped off somewhere so the buffer can be pushed back when not needed and then the hydraulic piston is re pressurised when in normal use.
Is it the same for rolling stock Mk2/3s and for the push pull 201s.
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