British Transport Police say it happened overnight Monday (2nd July) into Tuesday (3rd July)
Images of 4 large tags spreading the length of at least 3 windows have now been released.
BTP Devon & Cornwall tweeted to say those responsible risked their lives trespassing on the railway and their actions could land them with an unlimited fine or up to 10 years in prison.
They're now looking for those who caused the damage.
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