What services are there to find the nearest point on the map, taking into account the route by public transport?

Question

Geolocation

Hello!
I am looking for a service that could find the nearest points from m to d by a set of points on the map M, and a point on the map d. It is necessary to minimize the travel time from point m to point d by public transport.
The set M contains ~2000 elements. Every time the elements are different.
Does anyone know such?