Shipping it by train is pretty cheap. All stations will have loaders who will pack your bike securely for a fee (Rs 100 to 150 incl of material). Just remember that all breakable items that stick out (mirrors/indicators/levers etc) are better removed and stowed away. Stuff will probably be dumped on top of your bike in the train - be prepared and pack accordingly - usually the loaders do a pretty good job, esp if you offer a few rupees above the asking rate, which is a lot cheaper than getting that dent out of your tank or replacing broken plastic.

The railways are reasonable too - rate depends on the value of your bike, usually will be Rs 1 per km, or less.

V imp. -Drain your tank of all petrol, then leave the fuel cock open, after removing the fuel pipe to allow the remaining drops to evaporate, at the time of packing your bike. Inflammable materials on the train attract a stiff fine + jail term. At least a large bribe, at the very least, to compassionate officials who do not have the heart to make you a government guest during your holiday .

Also check whether octroi/ other taxes are due at the destination station (such as Mumbai). You may choose to book your bike to a station 50 km before your destination, and ride the rest of the way unless you actually like having long and fruitless discussions with officialdom on the tax issue.