If you can take 12620 from MAQ its good and if you are planning to take 12134 from MAJN, you will get city buses from State bank stop (close to MAQ) towards MAJN. Few buses go inside till station entrance and good number of buses drop you at highway which is around 1km away from station. For more details follow
/station/tips/2931Regarding Goa trip and visit to Dudhsagar, nearest railhead is Kulem and Castle rock and from there preferred route is trekking. Also depending on weather conditions, road travel is arranged by some groups which again includes trekking. If you want to watch in moving train any day time train passing by that route can be opted for.