The 2 wheeler parking available at main entry charges Rs 8/- for 4 hours. So if you park your vehicle for 24 hours you have to pay almost 50 rupees. So if under any consequences you are going to park your bike at railway station for 2,3 days , I suggest you to use Main Bus stand parking instead, there are 3 to 4 parking spaces available and they charge 10 rupees for 12 hours. (Main Bus stand is 600 meters from NZB Railway Station). So instead of paying 100/- for 2 days at station you can park at bus stand for just 40/-. All the parkings are safe, no worries.