Police were called to Burgess Hill Station in the early hours of this morning following reports of a cash machine having been broken into.
Officers from British Transport Police (BTP) remain at the scene today.
A spokesman said: "BTP were called to Burgess Hill station at 2.38am this morning (November 16), following reports of a cash machine having been broken into.
"Officers remain at the scene while they investigate.
"Anyone with information is asked to contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 34 of 16/11/18."