The calculated distance (air line) between Santo Domingo de los Colorados and La Troncal is approximately 150 miles respectively 242 kilometers.
By car or train, the actual journey to La Troncal is certainly longer, as only the direct route (as the crow flies) between Santo Domingo de los Colorados and La Troncal has been calculated here.
Air line (approximately)
242 kilometers
131 nautical miles