Gangchon Rail Park's official FAQ says direct website bookings receive a full refund if cancelled at least three days ahead, 80% when cancelled two days ahead and 70% one day ahead. On the travel day, cancellations must be completed at least one hour before departure to receive 50% back. Later cancellations, lateness and no-shows are non-refundable, and date changes are not allowed. You can look up bookings using your mobile phone number or the reservation code starting with RS. Travel-agent bookings follow the seller's rules. Bikes usually run in rain or snow, but operator-initiated safety closures can be fully refunded. The individual route schedule also says cancellation by 23:59 on the booking date gives a full refund, regardless of travel date; check your specific product's terms.