Find grocery stores within 400 meters of the METRO Green Line train: http://overpass-turbo.eu/s/oj3

green_line.ql

/*
This has been generated by the overpass-turbo wizard.
The original search was:
“railway=light_rail and name="Green Line"”
*/
[out:json][timeout:25];
// gather results
(
  // query part for: “railway=light_rail and name="Green Line"”

  
  way["railway"="light_rail"]["name"="Green Line"]({{bbox}});
  node(around:400)["shop"="supermarket"];
);
// print results
out body;
>;
out skel qt;