We just added this new train type to the object translation file.
},
"rct1.ride.spinning_cars": {
"reference-name": "Spinning Cars",
"name": "Spinning Cars",
"reference-description": "Circular roller coaster cars which are free to spin around their central axis.",
"description": "Circular roller coaster cars which are free to spin around their central axis.",
"reference-capacity": "4 passengers per car",
"capacity": "4 passengers per car"
},