There are many trains that you can take to reach Tarkarli. The nearest main rail head is Sawantwadi which is 50 Kms from Tarkarli For Detailed information on train timings Click here for Train Timings
Tarkarli is much farther than the other beaches from Pune or Mumbai but one of the best amongst all the beaches in the entire konkan stretch. There are many routes from Pune and the trip can be done in parts with different tourist destinations on the way depending on the route you take!!