The Metro-North is a commuter line from Grand Central Station in New York going North on a number of lines. The closest stop is Crestwood, about 15 minutes’ walk from St. Vlad’s. The subway can often be even cheaper, and get you to a wider variety of stops.
The train can be a very efficient way of getting into the city, and children ride for next to nothing when accompanied by an adult on weekends.
Times and fares are here.