What is the usual direction in which tourists travel now?
Many years ago, when Dudhsagar was not as well known as it is now, most of the visitors would come from the Londa side. The people coming from Goa side were usually much lesser in number.
They would take one of the weekly trains at Londa and get down at Dudhsagar, when the train stopped there for the brake test. (People interested in hiking along the railways tracks would get down at Castle Rock or Caranzol). In the evening, they used to get...
more... on to the Goa express, which used to halt at Dudhsagar on the uphill journey for picking up the staff from the station (The staff used the train to return to Castle Rock).
If the pattern is still the same, then it would make sense to reverse the timings and have this train connect to trains coming from Bangalore side at Londa in the morning.