Add "NYC live transit" overlay to OsmAnd
Then Menu - Configure map - Overlay map - NYC live transit.
https://osmand.net/add-tile-source?name=NYC+live+transit&url_template=https://transit.sandstorm.chat/tiles/{0}/{1}/{2}.png&ext=.png&min_zoom=8&max_zoom=18&tile_size=256&expiration_time_minutes=1